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). - PowerPoint PPT Presentation
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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: