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Question

The opposite vertices of a rectangle ABCD are A(-5,4) and C(5,-4) The area of the rectangle is
  1. 20
  2. 25
  3. 80
  4. 40

A
20
B
80
C
40
D
25
Solution
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Plot the points
Area of ABCD = AB×BC=10×8=80
1295199_379741_ans_184e5080816d4035867c793f557f2191.bmp

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