The width of a rectangle is fixed at 16cm. What lengths will make the perimeter greater than 84cm?
2 answers
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Let
L=length,
W=width=16 cm,
From Perimeter = 2(L+W)
we need
2(L+W)>84 cm
Substitute W=16 cm
we get
2(L+16)>84
(L+16)>84/2
L+16>42
L>?
