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6 April, 20:08

Alana's house sits on a rectangular lot with dimensions 62.4 feet by 108.6 feet. Use mental math to find the perimeter

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  1. 6 April, 20:10
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    62.4 + 108.6 = 171

    171*2 = (170+1) * 2=340+2=342

    Perimeter = 342 feet

    The perimeter of a figure is defined by length of its 2D shape.

    For a rectangle it is the sum of the length of all its sides

    P = a1 + a2 + b1 + b2

    Since a rectangle has two sides with the same lengths as the other two

    a1 = a2; b1 = b2

    P = 2 (a1 + b2)
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