triangle
a polygon with all sides the same length and all angles the same measure is called?
Triangle
Yes.
A regular polygon.
an irregular polygon.
regular polygon
a regular polygon
The question is not sufficiently well defined: the answer depends on same as WHAT! A polygon with the same sides and angle measurements as the corresponding sides and angles of another polygon is a congruent polygon. A polygon in which all the sides are the same length and all the angles are of equal measure is a regular polygon.
It is an equilateral triangle
An equilateral triangle
Equilateral triangle.
Any regular polygon