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23 January, 10:28

find the area of an Equalateral triangle (regular 3-gon) with the given measurement 9 inch perimeter? A = sq. in.

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  1. 23 January, 12:21
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    Step-by-step explanation:

    P = 3a (a is the side of triangle)

    a=P/3 = 3

    A=√3/4 a^2

    = √3/4 * 9 = 3.9 sq. inch
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