myhelper: SChand CLASS 9 Chapter 20 Coordinates and Graphs of Simultaneous Linear Equation Exercise 20(A)

EXERCISE 20 (A)

Question 1

Ans: 1 The points given. have been plotted on the graph

given below:

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Question 2

Ans: (i) The points

$A(4,2), B(-2,2)$ and

$D(4,-2)$ have been Plotted. To complete the rectangle the point C will be its fourth vertex whose co-ordinate are

$(-2,-2)$ .

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(ii) The points

$B(10,4), C(0,4)$ and

$(0,-2)$ have been plotted on the graph. 70 completed the rectangle the point A will be its fourth point whose co-ordinates are(10,-2)

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Question 3

Ans: Plot the points

$A(-2,4), C(4,10)$ and

$D(-2,10)$ on the graph and join them and complete the square

(i) The fourth point is B whose vertices are (4,4)

(ii) The mid-point of

$B C$ will be

$P$ whose co-co-ordinate will be

$(4,7)$

(iii) The mid point of CD will be whose co- ordinates will be (1,10)

(iv) Its diagonals AC and BD intersect each other at O whose co- ordinate will be (1,7)

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