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The sum of the internal angles in a polygon is equal to (n - 2) x 180 degrees. In this case, the sum of the internal angles in an icosagon (a 20-sided polygon is called an icosagon, from the Greek word ikosi meaning 20), is equal to (20 - 2) x 180 = 18 x 180 = 3240 degrees.

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Q: The sum of angles in degrees of a regular 20-gon?
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