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A rectangle is 3 times as long as it is wide, and its perimeter is 80 centimeters. Find its dimensions

User Sigmabeta
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Say the width is W and the length is L

L=3W (and of course W=W)

Now you use the perimeter formula P=2L+2W

80=2(3W) + 2W)

80=6W+2W

80=8W Divide both sides by 8

W=10

Now that you know the width, substitute it back into L=3W to find the length

L=3(10)

L=30

The dimensions are length: 30 cm and width: 10 cm

User Crayden
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