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Polygon
Derived from the Greek words “polús” and “gónu” which means “many angles” together
Triangle
Polygon with 3 sides
Quadrilateral
Polygon with 4 sides
Pentagon
Polygon with 5 sides
Hexagon
Polygon with 6 sides
Heptagon
Polygon with 7 sides
Octagon
Polygon with 8 sides
Nonagon
Polygon with nine sides
Decagon
Polygon with 10 sides
N-gon
Polygon with n sides
Convex polygon
All interior angles are less than 180°
Concave polygon
At least one interior angle is greater than 180°
Complimentary angle
2 angles that add up to 90°
Supplementary angle
2 angles that add up to 180°