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A twenty-sided polygon is called an "icosagon."

If it is a regular icosagon - all its sides and angles are equal - then it's interior angles are all 162 degrees.

You can verify this by drawing a line to the center from each angle.. There will be 20 small angles arranged in a circle around the center. These must total 360 degrees. As 360 / 20 = 18, this leaves the other angles of each triangle to add up to 162, because the interior angles of a triangle total 180 degrees.

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โˆ™ 2012-06-01 08:33:31
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Q: How many sides does a regular polygon have if its interior angles are 162 degrees each?
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