The perimeter of the rectangle below is 20 inches. what is the area of the rectangle, in square inches which is 3 inches

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08-02-2016
Mathematics

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The perimeter of the rectangle below is 20 inches. what is the area of the rectangle, in square inches which is 3 inches

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taskmasters taskmasters · Answer 1 · 2016-02-08T07:27:41+01:00

taskmasters taskmasters

08-02-2016

You are given the perimeter of a rectangle of 20 inches. You are also given the length of the rectangle in 3 inches. Note that the perimeter of a rectangle is 2L + 2W where L represents the length and W the width. Also, the area of the rectangle is length times width.

P = 2L + 2W
20 inches = 2(3 inches) + 2W
2W = 20 – 6
2W = 14
W = 7 inches

A = L*W
A = (3 inches)(7 inches)
A = 21 square inches

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