An equilateral triangle is an example of what kind of polygon? Convex, concave or irregular?
Equilateral triangle is a regular three-sided polygon.
It has three interior angles of
It's an example of a convex polygon.
There are a few different but equivalent definitions of a convex polygon.
One of them is as follows.
A polygon is called convex if all its interior angles are less than
Another definition is as follows.
A polygon is called convex if a segment that connects any two of its vertices lies within the boundaries of a polygon. Equilateral triangle, obviously, satisfies this definition.