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The area of a rectangle remains unchanged when it is made 5cm shorter and 5cm wider or when it is made 2cm longer and 1cm narro...Asked by MUKUL
The area of a rectangle remains unchanged when it is made 1cm shorter and 1cm wider or when it is made 8cm longer and 4cm narrower. Its area, in square cm
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Answered by
Topquark
Let's say the rectangle is x by y
A = xy =(x-1)(y+1) = (x+8)(y-4) which give x=10 & y=9 and so its area 90 sq cm.
A = xy =(x-1)(y+1) = (x+8)(y-4) which give x=10 & y=9 and so its area 90 sq cm.
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