What is the area of a regular decagon?

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What is the area of a regular decagon?

if each side measures 9 units and the apothem is 13.8 units.

621 square units
72 square units
108 square units
745 square units

2007-01-24 07:00:35 · 2 answers · asked by Anonymous in Education & Reference ➔ Homework Help

2 answers

621

The formula is 7.694s^ (approx).

7.694 x 9 x 9

2007-01-24 07:07:32 · answer #1 · answered by lou53053 5 · 0⤊ 0⤋

621 may be it. My calc got 623.052, 623.231 and 623.226 using different formulas. The formula to get the exact size gave me a brain cramp.

Good luck.

2007-01-24 15:38:29 · answer #2 · answered by CJohn317 3 · 0⤊ 0⤋