triangle
a triangle
12-sided two dimensional shape: dodecagon12-sided three dimensional shape: dodecahedron
A triangle.
triangle
a three sided shape
A three sided shape is a triangle, all the angles in a triangle add up to 180 degrees.
There is no such shape.
to be a three sided shape
a triangle
A triangle
There is no three-sided shape with two obtuse angles, because the three interior angles of a three-sided shape, which is a triangle, add up to 180 degrees, and two obtuse angles would be over 180 degrees.
A three sided shape is a triangle because of the beginning tri . Just remember it like a tricycle which has 4 wheels.