Question

Equilateral triangle is polygon.

• A. a regular
• B. an irregular
• C. not a

Answer 1

The correct option is A a regular

A polygon is a closed plane figure made up of 3 or more line segments.
A polygon is regular, if all its sides have the same length and all its angles have the same measure.
An equilateral triangle has all its sides equal. Hence the measure of all its angles must be equal to 60${}^{\circ }$[by angle sum property of a triangle].
Hence an equilateral triangle is a regular polygon.