pentagon
All of the angles are equal in a "regular" polygon. (All of the sides are too.)
15 equal sides
This is a tautological question that does not have a proper answer. A regular polygon is one which has all its sides of equal length and all its interior angles of equal measure.
It is then called a regular polygon when all angles and sides are of equal values.
It will have 4 sides which could be a square or a rectangle
A regular polygon has equal angles AND sides.
Not only can a regular polygon have equal angles and sides, it must have them.
regular
An equilateral triangle.
A polygon with sides of equal length and equal angles is termed a regular polygon.
A polygon with four equal angles and sides is a square.
A regular polygon has equal sides in length and angles.