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What is the area of a 20 sided regular polygon with a side length of 10 (for each side).

What is the area of a 20 sided regular polygon with a side length of 10 (for each side).
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What is the area of a 20 sided regular polygon with a side length of 10 (for each side).

User Jithu
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A=5a^2(1+\sqrt5+√(5+2\sqrt5))\\ A=5\cdot10^2\cdot(1+\sqrt5+√(5+2\sqrt5))\\ A=500(1+\sqrt5+√(5+2\sqrt5))\\ A\approx3157



\alpha=((n-2)\cdot180)/(n)\\\\ \alpha=((20-2)\cdot180)/(20)\\ \alpha=(18\cdot180)/(20)\\ \alpha=162
User Per Wiklander
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