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12-sided two dimensional shape: dodecagon12-sided three dimensional shape: dodecahedron
A three sided shape is a triangle because of the beginning tri . Just remember it like a tricycle which has 4 wheels.
An equilateral triangle.
It is a hendecahedron.
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