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OpenStudy (anonymous):
what is the measures of a 20-gon
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OpenStudy (aum):
The sum of all external angles of a n-gon adds to 360 degrees. A 20-gon has 20 external angles and their sum equals 360 degrees. Therefore, each external angle = 360 / 20 = 18 degrees. Each internal angle = 180 - external angle = 180 - 18 = 162 degrees.
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