Question

Which of the following is/are regular polygons?

• A. Equilateral triangle
• B. Square
• C. Parallelogram
• D. Rectangle

Answer 1

Answer: (A), (B)

The correct options are
A Equilateral triangle
B Square

A polygon, with all sides and all angles equal is called a regular polygon.

In an equilateral triangle all three sides are equal and all angles are equal to ${60}^{\circ }$.

In a square all four sides are equal and all four angles are equal to ${90}^{\circ }$.

In a parallelogram opposite sides are equal and opposite angles equal.

In a rectangle the opposite sides are equal, and all its angles are equal (to ${90}^{\circ }$).

Thus, a square and an equilateral triangle are regular poygons, whereas a rectangle and a paralleogram are not.