A rectangle has a perimeter of 24m. If its area is to be ...
A rectangle has a perimeter of 24m. If its area is to be maximum, find its dimension.
12, 12
6, 6
4, 8
9, 3
Correct answer is B
Perimeter=2(l+b)=24
l+b=12⟹l=12−b
Area=(12−b)×b=12b−b2
dAdb=12−2b=0 (at maximum)
2b=12⟹b=6
l=12−6=6m
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