decagon
The name of the angle which has three sided polygon called Triangle.
It is called a triangle. three-sided polygon is called a triangle, from the Greek word "tri" meaning "three" as in tricycle, or tripod. from : espi
=Pyramid=
Cirques
triangle
A three-sided, two-dimensional polygon is called a "triangle".
triangle
Octahedron.
A triangle.
A triangular pyramid.
A triangle