bellpreslee7839 bellpreslee7839

01-09-2018
Mathematics

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The width of a rectangle is 15 cm less than the length. the perimeter is 78 cm. find the rectangle's dimensions

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tramserran tramserran

07-09-2018

Length (L): L

width (w): L - 15

Perimeter (P) = 2L + 2w

78 = 2(L) + 2(L - 15)

78 = 2L + 2L - 30

78 = 4L - 30

108 = 4L

27 = L

width (w): L - 15 = 27 - 15 = 12

Answer: width = 12 cm, length = 27 cm

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