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31 August, 16:12

The length of a rectangle is four times its width. If the area is 400 cm squared, find its perimeter

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  1. 31 August, 17:35
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    If width of rectangle is a, then length is 4a and area = 4a2 which is given as 100 m 2. So a=5. Perimeter of rectangle = a+a+4a+4a = 10a = 50m
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