**Class 10 maths NCERT solutions of chapter 7**

**Class 10 maths NCERT solutions of chapter 7- Coordinate Geometry** are presented here for helping the students of **class 10** in their preparation of maths paper in SA-1 and SA-2 CBSE board exams. These **NCERT** **solutions** of** chapter 7-Coordinate geometry** will help you a complete understanding of the concept of **coordinate geometry** required to **solve** all the questions of **co-ordinate geometry** involved in the **10 class** **maths** question paper of the CBSE board 2020-21. All questions of **chapter 7- coordinate geometry** are solved by an expert of **maths** as per the CBSE norms and by the step by step method so that every student could understand the solutions.

**NCERT Solutions Class 10 Science from chapter 1 to 16**

**Class 10 maths ncert solutions chapter 1: Real numbers**

**10 class maths NCERT solutions of the chapter 2 :Polynomial**

**ncert solutions of Pair of Linear Equations**

**CBSE Class X Sample papers and Last years question papers of Science and Maths**

**Science and Maths NCERT solution for Class 9 to 11 class**

**CBSE solution of maths question paper 2020**

**CBSE 10 class most important questions of science**

**CBSE class 10 Latest science sample paper 2020**

**CBSE class 10 maths important questions: solutions**

**Class 10 maths ncert solutions chapter 1: Real numbers**

**Charts or graphs in Statistics**

**Q1. Find the distance between the following pairs of points:**

**(i) (2, 3), (4, 1)**

**(ii) (-5, 7), (-1, 3)**

**(iii) (a, b), (-a, -b**

Ans. (i) Let the points are denoted by A(2, 3) and B(4, 1)

Applying the distance (d) formula between two points (x_{1,} y_{1}) and (x_{2}, y_{2})

Here x_{1} =2, y_{1}= 3 and x_{2}=4 ,y_{2} = 1

(ii) A(-5, 7), B(-1, 3)

x_{1} = -5, y_{1}= 7 and x_{2}= -1 ,y_{2} = 3

x_{1} = a, y_{1}= b and x_{2}= -a ,y_{2} = -b

**Q2.Find the distance between the points (o,0) and (36,15). Can you now find the distance between the two towns A and B discussed in section 7.2.**

Ans. Let the town A (0,0) and town B(36,15), so the distance (d) between two points is

x_{1} = 0, y_{1}= 0 and x_{2}= 36 ,y_{2} = 15

So, the distance between two towns A and B is = 39 units

**Q3.Determine if the points (1,5), (2,3) and (-2,-11) are collinear.**

Ans. Let the points are denoted by A (1,5), B(2,3) and C(-2,-11)

If the points A, B and C are collinear then they should have to satisfy the following

AB + BC = AC

The distance between A (1,5), B(2,3)

x_{1} = 1, y_{1}= 5 and x_{2}= 2 ,y_{2} = 3

AB + BC ≠AC

Hence A, B, and C are not collinear

**Q4.Check whether (5,-2), (6,4), and (7, -2) are the vertices of an isosceles triangle.**

Let the vertices of the triangle are A(5,-2), B(6,4), and C(7, -2)

AB = BC

Therefore (5,-2), (6,4), and (7, -2) are the vertices of an isosceles triangle

**Q5. In a classroom, 4 friends are seated at points A, B, C, and D as shown in the given figure. Champa and Chameli walk into the class and after observing for a few minutes Champa asks Chameli, “Don’t you think ABCD is a square?” Chameli disagrees. Using distance formula, find which of them is correct.**

Ans. It is seen in the figure that the coordinates of the A, B, C and are follows

A(3,4), B(6,7), C(9,4) and D(6,1)

For checking ABCD is a square, let’s check the length of 4 sides and diagonals by applying the distance formula

So, AB = BC = CD = AD

Now the calculating length of the diagonals AC and BD

The coordinates of both ends of the diagonal AC are (3,4) and (9,4)

The coordinates of both ends of the diagonal BD are (6,7) and (7,1)

The length of both diagonals are also equal

Since all sides and diagonals of ABCD are equal, so Champa is correct that ABCD is a square.

**Q6.Name the type of quadrilateral formed, if any, by the following points, and give reasons for your answer.**

**(i) (-1, -2), (1, 0), (-1, 2), (-3, 0)**

**(ii) (-3, 5), (3, 1), (0, 3), (-1, -4)**

**(iii) (4, 5), (7, 6), (4, 3), (1, 2)**

Ans. (i) Let the vertices of the quadrilateral are A (-1, -2), B(1, 0), C(-1, 2) and D(-3, 0)

Determining the length of the sides AB, BC, CD, AD, and diagonals AC and BD by applying the distance formula

The length of all sides AB = BC = CD = AD = 2√2 and length of diagonals AC = BD = 4,therefore ABCD is a square.

(i) Let the vertices of the quadrilateral are A (-3, 5), B(3, 1), C(0, 3) and D(-1, -4)

Determining the length of the sides AB, BC, CD, AD by applying the distance formula

All sides are not equal, therefore the given points are vertices of a simple quadrilateral

(iii) Let the vertices of the quadrilateral are A(4, 5), B(7, 6), C(4, 3), D(1, 2)

Determining the length of the sides AB, BC, CD, AD by applying the distance formula

AB = CD = √10 and BC = AD = 3√2

Opposites sides of the quadrilateral are equal therefore ABCD is a parallelogram

**Q7. Find the point on the x-axis which is equidistant from (2, -5) and (-2, 9).**

Ans. Let the point on the x-axis is A(x, 0) which is equidistant from B(2, -5) and C(-2, 9)

∴ AB = AC

The distance between A(x,0) and B(2, -5) = The distance between A(x,0) and C(-2, 9)

x² – 4x +29 = x ² + 4x + 85

8x = – 5 6

x = -7

Hence the point on the x-axis is A(-7, 0) which is equidistant from B(2, -5) and C(-2, 9)

**Q8. Find the values of y for which the distance between the points P (2, -3) and Q (10, y) is 10 units.**

Ans. The distance between the points P (2, -3) and Q (10, y) = 10 units

64 + 9 + y² + 6y = 100

y² + 6y – 27 = 0

y² + 9y – 3y – 27 = 0

y(y + 9) – 3( y + 9) = 0

(y + 9)( y – 3) = 0

y = -9, y = 3

Hence the required value of y is – 9 or 3

**Q9. If Q (0, 1) is equidistant from P (5, -3), and R (x, 6), find the values of x. Also, find the distances QR and PR.**

Ans. We are given that Q (0, 1) is equidistant from P (5, -3), and R (x, 6)

The distance between Q(0,1) and P(5, -3) = The distance between Q(0,1) and R(x, 6)

25 +16 = x² + 25

x = ± 4

The coordinates of Q are (0,1) and of R are ( ± 4, 6)

The coordinates of P are (5,-3) and of R are ( ± 4, 6)

Taking P(5, -3) and R( 4, 6)

Taking P(5, -3) and R( -4, 6)

Therefore QR = √41 and PR = √82, 9√2

**Q10.Find a relation between x and y such that the point (x, y) is equidistant from the points (3, 6) and (-3, 4).**

Ans. It is given to us that the point (x, y) is equidistant from the points (3, 6) and (-3, 4)

The distance between (x.y) and (3,6) = The distance between (x,y) and (-3,4)

Squaring both sides

(x – 3)² + ( y – 6)² = (x + 3)² + ( y – 4)²

x² + 9 – 6x + y² + 36 – 12y = x² + 9 + 6x + y² + 16 – 8y

– 6x – 6x – 12y + 8y + 45 – 25 = 0

– 12x – 4y + 20 = 0

–4(3x + y – 5) = 0

3x + y – 5 = 0

Hence required relationship between x and y is 3x + y – 5 = 0

EXERCISE 7.2

**Q1**.** Find the coordinates of the point which divides the join of (- 1, 7) and (4, – 3) in the ratio 2:3.**

Ans. Let the coordinates of the point C are (x,y) which divides the join of **(- 1, 7) and (4, – 3)**

Applying the section formula

**x _{1} = –1, y_{1}= 7 , x_{2 }= 4, y_{2}= – 3, m_{1} = 2, m_{2} = 3**

x = 1, y =3

Hence the coordinates of C are (1,3)

**Q2.Find the coordinates of the points of trisection of the line segment joining (4, -1) and (-2, -3).**

**Solution:**

Ans. Let P(a,b) and Q(c,d) trisect the line segment joining A(4, -1) and B(-2, -3)

Applying the section formula for coordinates of P(a,b) that divides the given line segment in 1 : 2

**x _{1} = 4, y_{1}= -1, x_{2 }= -2, y_{2}= – 3, m_{1} = 1, m_{2} = 2 and (x,y) = (a, b)**

a = 2, b = –5/3, Coordinates of P are ( 2, -5/3)

Co-ordinates of Q are 1/2(2 -2),1/2[(-5/3)-3] =(0,-10/3)

Q3.(c,d) is the mid points of the line segment joing P(a,b) and B(-2,-3), (a,b) = (2, -5/3)

c = 0, d = -7/3

So, coordinates of Q are (0, -7/3)

Hence the points P(2, -5/3) and Q(0. -7/3) trisects the line segment AB.

**Q3.To conduct Sports Day activities, in your rectangular shaped school ground ABCD, lines have been drawn with chalk powder at a distance of 1 m each. 100 flower pots have been placed at a distance of 1 m from each other along with AD, as shown in the following figure. Niharika runs 1/4 th the distance AD on the 2nd line and posts a green flag. Preet runs 1/5th the distance AD on the eighth line and posts a red flag. What is the distance between both the flags? If Rashmi has to post a blue flag exactly halfway between the line segment joining the two flags, where should she post her flag?**

Ans. We are given distance AD = 100 m and 100 flower pots which are placed at a distance of 1 m.

Niharika placed the flag on the second line at a distance of

Niharika placed the flag at a distance of 25 m from the starting point means on the line of 25 th flower pot, so the coordinates of the point Niharika placed the flag are (2, 25)

Preet placed the flag on the eighth line at a distance of

Niharika placed the flag at a distance of 20 m from the starting point means on the line of 20 th flower pot, so the coordinates of the point Niharika placed the flag are (8, 20)

The distance between both of the flags located at(2,25) and (8,20) is

So, the distance between both of the flags is √61 m.

Rashmi placed the flag at the midpoint of both of these flags located at (2, 25) and (8, 20), let the coordinates of the point at which Rashmi posted the flag are (x, y).

Rashmi placed her blue flag on 5 th line at a distance of 22.5 m.

**Q4**.**Find the ratio in which the line segment joining the points (-3, 10) and (6, – 8) is divided by (-1, 6).**

Ans. Applying the section formula

x_{1} = -3, y_{1}= 10 and x_{2}= 6 ,y_{2} = -8, x = -1, y = 6 and k= m_{1}/m_{2} where (m_{1} : m_{2}) is the ratio at which (-1, 6) point divides the line segment

-k -1 = 6k – 3, 6k + 6 = -8k + 10

-7k = -2, 14 k = 4

k = 2/7, k = 2/7

Both of the equation confirms that the point (-1, 6) divides the line segment in 2 : 7.

**Q5. Find the ratio in which the line segment joining A (1, – 5) and B (- 4, 5) is divided by the x-axis. Also find the coordinates of the point of division.**

Ans. Let the point on x-axis at which the line segment **joining A (1, – 5) and B (- 4, 5) is divided by the x-axis is = (x, 0)**

We are having the known value of y coordinate of (x,0) = 0, so applying the section formula accordingly.

y_{1}= -5 , y_{2} = 5, y = 0

5k – 5 = 0

k = 1

Hence the ratio at which the line segment is divided by x axis is 1 : 1.

**Let the coordinates of the point of division are (x,y)**

x_{1} = 1, y_{1}= -5 and x_{2}= -4 ,y_{2} = 5, (x , y) = (x,0), k = 1

Hence the coordinates of point of division are (-3/2, 0)

**Q6. If (1, 2), (4, y), (x, 6) and (3, 5) are the vertices of a parallelogram taken in order, find x and y.**

Ans. Let the vertices of a parallelogram are A(1, 2), B(4, *y*), C(*x*, 6) and D(3, 5)

Since the diagonals of a parallelogram bisect each other

The midpoint of AC = Midpoint of BD

x = 6

y = 3

Hence the value of x = 6 and of y = 3

**Q7.Find the coordinates of point A, where AB is the diameter of a circle whose centre is (2, – 3) and B is (1,4).**

Ans. AB is the diameter of the circle and the coordinates of B and of centre are given (1,4) and (2, -3) respectively.

Let the coordinates of another end(A) of diameter is = (x, y)

(2, -3) is the centre of circle so it is the midpoint of AB

x = 3

y = -6 – 4 = -10

Hence the coordinates of A are (3, -10)

**Q8. If A and B are (-2, -2) and (2, -4), respectively, find the coordinates of P such that AP = 3/7 AB and P lies on the line segment AB.**

Ans.

We are given that

Subtracting 1 from both sides

AB – AP = BP

AP: BP = 3 : 4

Coordinates of both ends of line segments are A(-2,-2) and B(2, -4) . Let coordinates of P are (x, y) that divides AB in 3 : 4.

Applying the section formula

x_{1} = -2, y_{1}= -2 and x_{2}= 2 ,y_{2} = -4, ,m_{1} = 3, m_{2} = 4

Hence the coordinates of P are (-2/7, -20/7)

**Q9.Find the coordinates of the points which divide the line segment joining A (- 2, 2) and B (2, 8) into four equal parts.**

Ans.Drawing a line segment AB in which P, Q and R points divide it into four equal parts

It is seen in the figure that P , Q, and R divides AB in the ratio of 1 : 3, 1: 1 and 3: 1 respectively

For calculating the coordinates of P (x,y) , applying section formula

x_{1} = -2, y_{1}= 2 and x_{2}= 2 ,y_{2} = 8, ,m_{1} = 1, m_{2} = 3

x = -1, y = 7/2

So, coordinates of P are (-1, 7/2)

Q is the midpoint of AB, the coordinates of A and B are (-2,2) and (2,8)

So, coordinates of Q = 1/2(-2 +2), 1/2(2 + 8)= (0,5)

R is the mid point of BQ, the coordinates of B and Q are (2. 8) and (0,5)

So, coordinates of R = 1/2(2 +0), 1/2(8 + 5) = (1, 13/2)

Hence the coordinates of P, Q and R are (-1, 7/2), (0,5) and (1, 13/2) respectively

**Q10.Find the area of a rhombus if its vertices are (3, 0), (4, 5), (-1, 4) and (-2,-1) taken in order.**

**[Hint: Area of a rhombus = 1/2(product of its diagonals)]**

Ans. Let the vertices of the rhombus are A(3,0), B(4,5), C(-1,4) and D(-2, -1) respectively

Area of rhombus = 1/2(Product of diagonals)

So, let’s found out the length of the diagonals AC and BD by applying the distance formula

Area of rhombus ABCD = 1/2(AC× BD) = 1/2( 4√2 × 6√2) = 1/2(24 × 2) = 24 Sq.unit

**EXERCISE 7.3**

**Q1. Find the area of the triangle whose vertices are:**

**(i) (2, 3), (-1, 0), (2, -4)**

**(ii) (-5, -1), (3, -5), (5, 2)**

Ans. Area of Δ

(i) Let vertices of the triangles are A(2, 3), B(-1, 0) and C(2, -4)

x_{1} = 2, y_{1} = 3, x_{2}= -1, y_{2} = 0, x_{3} = 2, y_{3} = – 4

Substitute all the values in the above formula, we get

Area of Δ

Therefore area of the triangle is = 10.5 sq.unit

(ii) Let vertices of the triangles are A**(-5, -1) , B (3, -5) and C(5, 2)**

**x _{1} = -5, y_{1} = -1, x_{2}= 3, y_{2} = -5, x_{3} = 5, y_{3} = 2**

Therefore area of triangle is = 32 sq.unit

**Q2. In each of the following find the value of ‘k’, for which the points are collinear.**

**(i) (7, -2), (5, 1), (3, -k)**

**(ii) (8, 1), (k, -4), (2, -5)**

Ans. The points will be collinear if the area formed by these points is zero, since the figure formed by the three points must be a triangle, so applying the formula of triangle.

(i) x_{1} = 7, y_{1} = -2, x_{2}= 5, y_{2} = 1, x_{3} = 3, y_{3} = -k

7(1 +k) + 5(-k + 2) + 3( -2 -1) = 0

7k -5k + 7 + 10 – 9 = 0

2k + 8 = 0

k = – 4

(ii) The points will be collinear if the area of the triangle formed by the points (8, 1), (k, -4), (2, -5) is zero.

x_{1} = 8, y_{1} = 1, x_{2}= k, y_{2} = -4, x_{3} = 2, y_{3} = -5

8 – 6k +10 = 0

-6k = -18

k = 3

**Q3**.**Find the area of the triangle formed by joining the mid-points of the sides of the triangle whose vertices are (0, -1), (2, 1) and (0, 3). Find the ratio of this area to the area of the given triangle.**

Ans. Let the verteces of the triangle are A**(**0, -1), B (2, 1) and C(0, 3)

The cordinates of A and B are (0, -1) and (2, 1)

So, the mid point of AB = 1/2(0 + 2)/2, 1/2(-1 + 1)/2 = D(1, 0)

The cordinates of B and C are (2, 1) and (0, 3)

So,the mid point of BC are = 1/2(2+0), 1/2(1 +3) = F(1 , 2)

The cordinates of A and C are (0, -1) and (0, 3)

So,the mid point of AC are = 1/2(0 +0), 1/2(-1 +3) = E(0 , 1)

The vertices of the ΔABC are **(**0, -1), (2, 1) and (0, 3)

x_{1} = 0, y_{1} = -1, x_{2}= 2, y_{2} = 1, x_{3} = 0, y_{3} = 3

arΔABC = 4 sq.unit

The vertices of the ΔDEF are **(1**, 0), (0, 1) and (1, 2)

x_{1} = 1, y_{1} = 0, x_{2}= 0, y_{2} = 1, x_{3} = 1, y_{3} = 2

arΔDEF = -1 , avoiding minus sign because area can’t be negative

arΔDEF = 1 square unit

The ratio of ΔDEF to ΔABC

Therefore the required ratio of both triagles is 1 : 4

**Q4.Find the area of the quadrilateral whose vertices, taken in order, are**

**(-4, -2), (-3, -5), (3, -2) and (2, 3).**

Ans. Let the vertices of quadrilatral are A(-4, -2), B(-3, -5), C(3, -2) and D(2, 3)

After we draw a diagonal AC, we get two triangles ΔABC and ΔADC

The triangle ABC has the vertices ( -4, -2), (-3, -5) and (3, -2 )

x_{1} = -4, y_{1} = -2, x_{2}= -3, y_{2} = -5, x_{3} = 3, y_{3} = -2

So, area of ABC is = 10.5 sq.unit

The triangle ADC has the vertices ( -4, -2), (2, 3) and (3, -2 )

x_{1} = -4, y_{1} = -2, x_{2}= 2, y_{2} = 3, x_{3} = 3, y_{3} = -2

Avoiding minus sign because area can’t be negative

arΔADC = 35/2 = 17.5 sq,unit

Area of given quadrilateral ABCD = ar ΔABC + ar ΔADC = 10.5 + 17.5 = 28 sq.unit

**Q5**.**You have studied in Class IX that a median of a triangle divides it into two triangles of equal areas. Verify this result for ΔABC whose vertices are A (4, – 6), B (3, – 2) and C (5, 2).**

Ans. We are given the vertices of the triangle A (4, – 6), B (3, – 2) and C (5, 2)

Let CD is the mediun of the triagle ABC, so D is the mid point of AB

The coordinates of D are = 1/2(4 +3), 1/2(-6 -2) = (7/2, -4)

We have to show the area of triagle ADC = area of triagle DBC

The verteces of the triagle ADC are (4, -6), (5, 2), C(7/2, -4)

x_{1} = 4, y_{1} = -6, x_{2}= 5, y_{2} = 2, x_{3} = 7/2, y_{3} = -4

Area of triagle

The vertices of the triangle DBC are (7/2, -4), (3, -2), C(5, 2)

x_{1} = 7/2, y_{1} = -4, x_{2}= 3, y_{2} = -2, x_{3} = 5, y_{3} = 2

Avoiding minus sign because area can’t be negative

So, area of triangle DBC = 3 sq.unit

Hence area of ADC = area of DBC

Therefore mediun CD divides the triangle ABC into two equal parts.

**Exercise 7.4**

**Q1. Determine the ratio in which the line 2x + y – 4 = 0 divides the line segment joining the points A(2, –2) and B(3, 7).**

Ans. Let the given line divides the line segment in the ratio of (m_{1} : m_{2}) and the point of intersection is x, y

x_{1} = 2, x_{2}= 3, y_{1} = -2, y_{2} = 7

Since the line **2x + y – 4 = 0 passes through the poins(x, y), so the coordinates will satisfy the equation.**

_{}

Therefore the given line divides the line segment in 2 : 9

**Q2. Find the relation between x and y if the points (x, y), (1, 2) and (7, 0) are collinear. **

Ans. If the given points are collinear then the area of the triangle formed by these points must be zero

x_{1} = x, x_{2}= 1, y_{1} = y, y_{2} = 2, x_{3} = 7, y_{3} = 0

2x – y + 7y -14 = 0

2x + 6y = 14

x + 3y = 7

Therefore the required relationship between x and y is x + 3y = 7

**Q3. Find the centre of a circle passing through points (6, -6), (3, -7) and (3, 3).**

Ans. Let the centre of circle is (x, y), the distance of the centre to the circle is known as radii

So, the distance between (x,y) and **(6, -6) = The distance between (x,y) and (3, -7)**

x² + 6² – 12x + y² + 6² + 12x = x² + 3² – 6x + y² + 7² + 14y

72 = -6x + 14y + 9 + 49

6x – 14y + 14 = 0

3x – 7y + 7 = 0…….(i)

The distance between (x,y) and **(6, -6) = The distance between (x,y) and (3, 3)**

x² + 6² – 12x + y² + 6² + 12x = x² + 3² – 6x + y² + 3² – 6y

72 = -6x – 6y + 18

6x + 6y + 54 = 0

x + y + 9 = 0…….(ii)

Multiplying eq. by 3 , we get eq.(iii)

3x + 3y + 27 = 0……(iii)

Subtracting eq.(i) from (iii)

10y + 20 = 0

y = -2

Putting the value of y = -2 in eq.(1)

x = 3

Therefore coordinates of the centre of the circle is (3, -2)

**E-books of Physics, chemistry, maths and biology for class 9 to 12**

**Heavy discount on Roll top desktop**

**The best and latest Laptops in the market for students and office worker**

**The Best updated Camcorders: Camera with video recordings**

**Top rated mobile Phones in the Amazon**

**The top branded shoes in the market for men**

strap says

Mｙ spouse and I abѕolutely love your blog and find most of ｙour post’s to be precisely what I’m looking for.

can you offer guest writeгs to ᴡrite cߋntent avaiⅼable for you?

I wouldn’t mind producing a post or elaborating

on a number of the subjects you write concerning heｒe.

Again, awesome site!