Are all regular polygons squares

Answer 1

Yes. By definition, a regular polygon is a polygon that has all its sides the same length and all its angles equal. A square has all four sides the same length and all four angles equal to 90 degrees. So every square is a regular polygon.

Answer 2

No they don't have to be some times it can be a triangle which all it's sides are equal.. but there are others like hexagons with equal sides

rectangles cant though

a regular polygon is something will equal sides.