1. square
2. hexagon
3. pentagon
4. rectangle
5. triangle
6. circle
7. octagon
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Regular shapes are shapes where all the sides and angles are equal. One example of a regular shape is a square because all the sides are the same and all the angles are 90 degrees.
Regular shapes:all sides and angles are the same Irregular shapes: different angle and sides
A regular polygon has all its angles and equal and all its sides equal. Irregular poygons do not. Some people consider only convex shapes meeting these criteria as being regular polygons while others include "star" shapes.
Squares are regular all the time. Diamonds, hexagons and pentagons are sometimes regular.
Some do, some don't. A regular polyhedron such as the tetrahedron has none whereas an irregular one like the parallelepiped can have several.