A 12 sided figure is called a dodecagon. This type of polygon has 12 angles and each angle equals 150 degrees.
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A Dodecahedron has twelve pentagonal faces. A Dodecagon is a plane figure with twelve sides.
it is called a dodecahedron (DO-DEKA-HEAD-RON)
It is called a Do-decagon.
The name of a four sided figure (or shape) is called a Square. :)
Heptagon - a seven sided two demensional figure