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A regular polygon is a shape in which all the sides are equal and all the angles are equal.

An equilateral triangle is a regular polygon:

• It has three equal sides.
• It has three equal angles.
• It has three lines of symmetry

A square is a regular polygon:

• It has four equal sides.
• It has four equal angles.
• It has four lines of symmetry.

A regular pentagon shows the same pattern:

• It has five equal sides.
• It has five equal angles.
• It has five lines of symmetry.