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Textbook 542-544. Other Polygon Prefixes. Nine=nonagon. 10=decagon 12=dodecagon. To find the total number of internal degrees of a polygon use the formula: 180(n-2).
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Other Polygon Prefixes. • Nine=nonagon. • 10=decagon • 12=dodecagon
To find the total number of internal degrees of a polygon use the formula: • 180(n-2)