construct icosagon.....
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The regular icosagon has Schläfli symbol {20}, and can also be constructed as a truncated decagon, t{10}, or a twice-truncated pentagon, tt{5}. One interior angle in a regular icosagon is 162°, meaning that one exterior angle would be 18°.
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Answer:
Icosagon :
Area: ½ × perimeter × apothem
Perimeter: 20 x side
Number of vertices: 20
Number of edges: 20
Internal angle: 162°
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