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Harmon Wood · Answer 1 · 2019-05-18T16:54:16+0000

PENTA=5, so the pentagon is a 5-sided polygon.

on side's length is 9, so all sides added, namely the perimeter is 9+9+9+9+9, or 45. We know the apothem is 6.2.

$\bf \textit{area of a regular polygon}\\\\ A=\cfrac{1}{2}(apothem)(perimeter)$

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