Q: How many faces and verticies does a prism with 21 edges have?

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7 faces, 7 vertices's, 12 edges.

A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges. 12 edges

4 Verticies, 4 edges

A rectangle has one face, four edges, and four verticies.

Five faces, six vertices.

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20

7 faces, 7 vertices's, 12 edges.

A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges. 12 edges

A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges.

4 Verticies, 4 edges

A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges.

A square pyramid has 5 faces , 5 verticies and 8 edges

A rectangle has one face, four edges, and four verticies.

Faces . . . 6 Edges . . . 12 Vertices . . 8

Five faces, six vertices.

It has 4 faces, 4 vertices and 6 edges.

A cube has 8 verticies {corners} 12 edges and 6 faces