A polygon is called regular if it has equal sides and angles. Thus, a regular triangle is an equilateral triangle, and a regular quadrilateral is a square.

Does a regular polygon have all equal sides?

In Euclidean geometry, a regular polygon is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length).

Can a regular polygon have equal sides but not angles?

Mark D. A polygon with equal sides and and angles is a regular polygon. If its sides or angles are not equal it is irregular.