Perimwter is 100 find area
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2(l+b) = 100
l+b = 50
l = 50-b
area = l×b
= (50-b)b
= 50b-b^2
= b^2 -50
b = √50
b = 5√2
l= 50-5√2
lb = (5√2)50-5√2
= 250√2-50
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