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Geometric terms for polygons

Polygon A closed plane figure made up of line segments.
Quadrilateral A polygon with four sides.
Square Quadrilateral with four equal sides and four right angles.
Rectangle Quadrilateral with four right angles, and the opposite sides are parallel and the same length.
Triangle A polygon with three sides.
Pentagon A polygon with five sides.
Hexagon A polygon with six sides.
Heptagon A polygon with seven sides.
Octagon A polygon with eight sides.
Nonagon A polygon with nine sides.
Decagon A polygon with ten sides.
Created by: Albert4th