Cirques
a deep, steep-sided, narrow river valley
The name of the angle which has three sided polygon called Triangle.
It is called a 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=
triangle
A three-sided, two-dimensional polygon is called a "triangle".
triangle
Octahedron.
Submarine Canyons
A triangle.