rickydragondonut rickydragondonut

22-03-2018
Mathematics

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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?

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 62 centimeters class=

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rosedryerp5x0kv rosedryerp5x0kv

22-03-2018

[tex]A = \frac{5}{2} a^2 \sqrt{5 + 2 * \sqrt{5} }[/tex]
a=side length
[tex]A = \frac{5}{2} (4)^2 \sqrt{5 + 2 * \sqrt{5} }[/tex]

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