# PSEB Solutions for Class 10 Maths Chapter 7 Coordinate Geometry Ex 7.2

PSEB Solutions for Class 10 Maths Chapter 7 Coordinate Geometry Ex 7.2

## PSEB 10th Class Maths Solutions Chapter 7 Coordinate Geometry Ex 7.2

Q.uestion 1.

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

Solution:

Let required point be P (x, y) which divides the join of given points A (- 1, 7)

and B (4, – 3) in the ratio of 2 : 3.

(-1, 7) (x, y) (4, – 3)

Question 2.

Find the co-ordinates of the points of trisection of the line segment joining (4, – 1) and (2, – 3).

Solution:

Let P (x_{1}, y_{1}) and Q (x_{2}, y_{2}) be the required points which trisect the line segment joining A (4, – 1)and B (- 2, – 3) i.e., P(x_{1}, y_{1}) divides AB in ratio 1: 2 and Q divides AB in ratio 2 : 1.

Question 3.

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 1m from each other along AD, as shown in fig. Niharika runs 1/4 th the distance AD on the 2nd line and posts a green flag.

Preet runs 1/5 th the distance AD on the eighth line and posts a red flag. What is the distance betweenboth the flags? If Rashmi has to post a blue flag exactly half way between the line (segment) joining the two flags, where should she post her flag?

Question 4.

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

Solution:

Let point P (- 1, 6) divides the line segment joining the points A (- 3, 10) and B (6, – 8) the ratio K : 1.

Question 5.

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 co

ordinates of the point of division.

Solution:

Let required point on x-axis is P (x, 0) which divides the line segment joining the points A (1, – 5) and B (- 4, 5) in the

ratio K : 1.

Question 6.

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

Solution:

Let points of parallelogram ABCD are A (1, 2) (4, y) ; C (x, 6) and D (3, 5)

But diagonals of a || gm bisect each other.

Case I. When E is the mid point of A (1, 2) and C (x, 6)

∴ Co-ordinates of E are:

and 4 = 5+y/2

or 8 = 5 + y

or y = 3

Hence, values of x and y are 6 and 3.

Question 7.

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

Solution:

Let, coordinates of A be (x, y). But, centre is the’ niij ioint of the vertices of the diameter.

Question 8.

If A and B are (- 2, – 2) and (2, – 4) respectively, find the coordinates of P such that AP = AB and P lies ¡n the line segment AB.

Solution:

Question 9.

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

Solution:

Let required points are C, D and E which divide the line segment joming the points A (- 2, 2) and B (2, 8) into four equal parts. Then D is mid point of A and B ; C is the mid point of A and D ; E is the mid point of D and B such that

AC = CD = DE = EB

Question 10.

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

[Hint: Areas of a rhombus = 1/2 (Product of its diagonals)]

Solution:

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