What is a triangle with three sides called?

Answer 1

Since the question asks for sides, the answer would be an equilateral triangle. An equilateral triangle has three congruent sides.

Of course, an equilateral triangle is also an equiangularone. All sides are the same length, so all three angles are 60° . Congruence is usually applied with respect to TWO triangles. If each triangle has three sides equal to the other triangle's three sides, then the triangles are congruent.
equilateral

Answer 2

By definition, a triangle must have three sides and three angles, and it is called a triangle. In a very general sense, it's a polygon, but we have a very specific name for a closed planar figure composed of (three) line segments: the triangle.

Answer 3

All triangles have three sides."Tri-angle" means "three angles," and if a shape has three angles, then it also has three sides. A triangle with three sides of the same length is called an "equilateral" or "regular" triangle, one with only two equal sides is "isosceles," and one with three sides of different lengths is called "scalene."

Answer 4

An equilateral triangle is a triangle possessing three congruent sides.

Answer 5

A polygon with 3 sides.