A regular decagon has side lengths of 4 centimeters long. If the decagon is divided into 10 congruent triangles, each has an approximate height of 6.2 centimeters. What is the approximate are of the decagon?

asked Apr 28, 2019 103k views

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4 votes

$A = (5)/(2) a^2 \sqrt{5 + 2 * √(5) }$
a=side length

$A = (5)/(2) (4)^2 \sqrt{5 + 2 * √(5) }$

Sellmeadog answered May 4, 2019

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