Polygons

Name No of sides Internal angle

Triangle 3 60°

Square 4 90°

Pentagon 5 108°

Hexagon 6 120°

Heptagon 7 128.6°

Octagon 8 135°

Nonagon 9 140°

Decagon 10 144°

Undecagon 11 147.3°

Dodecagon 12 150°
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