Question

perimeter of a square quals to perimeter of ractrangle. if area of ractrangle is 100 less then area of square than find the langthbof ractangle​

Answer 1

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4a = 2(l+b)

2a = (l+b)

a = (l+b)/2

a² = (l+b)²/4 ----------(1)

and ,

a² - (lb) = 100 -----------(2)

putting (1) in (2) we get ,

l²+b²+2lb-4lb/4 = 100

(l-b)² = 400

(l-b) = 20

what we have to find now ?? Do it by yourself now . Hope this helps you ..

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