A polyhedron with 20 faces is called an icosahedron.
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Tetrahedron (4 faces), Cube (6), Octahedron (8), Dodecahedron (12) and Icosahedron (20).
Icosahedron are 3-D solid shapes with 20 triangualr faces. They are used as dice is many games, such as Dungeons & Dragons.
20 faces and 10 sides
A twenty sided, 2D figure is called an icosagon.
Oh, dude, a prism with 20 vertices has 10 faces. Each face of the prism connects two of the vertices, so you gotta divide the total number of vertices by 2 to get the number of faces. Math can be pretty chill when you break it down like that.