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A triangle has an internal angle of 180/3 A square has an internal angle of 360/4 A pentagon has an internal angle of 540/5 An 'x'-agon has an internal angle (180(x-2))/x = (180x-360)/x = 180 - 360/x A 20-agon has an internal angle of 180 - 360/20 = 162

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Each exterior angle: 18 degrees

Each interior angle: 162 degrees

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8y ago
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Q: What is the measure of one angle of a regular convex 20-gon?
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