Tetrahedron,
Cube
Octahedron
Dodecahedron
Icosahedron
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5 tetrahedron, cube, octahedron, dodecahedron, and Icosahedron
A regular triangle is called an equilateral triangle. A regular quadrilateral is called a square. Did that help??? cone, sphere, cube, polyhedrons
No. Polyhedrons are any shape with multiple sides. A triangle and a prism are just two different kinds of polyhedrons.
Yes, an empty box is and No, polyhedrons don't have to be.
Many things have 2 sides that are congruent, including isoceles triangles, any regular polygons or polyhedrons, rectangles, etc.