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A polygon is a flat, 2D shape.
It has straight sides and is fully closed.
All of the sides are straight and joined up.
Polygons can have any number of sides.
Regular polygons:
A regular polygon has all sides of the same length and all sides at the same angle.
An equilateral triangle is a regular polygon; all of its sides and angles are the same.
Irregular polygons:
An irregular polygon is a shape with sides and/or angles at differing lengths and sizes.
A scalene triangle has differing angles and sides.
