Answer:
perimeter = 2 (l + b)
half perimeter = l + b but l = b + 4
so, 36 = l + b
and 4 = l - b
adding both equation
40 = 2l
l = 40 / 2 = 20
b = 20 - 4 = 16
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Answer:
perimeter = 2 (l + b)
half perimeter = l + b but l = b + 4
so, 36 = l + b
and 4 = l - b
adding both equation
40 = 2l
l = 40 / 2 = 20
b = 20 - 4 = 16