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5

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An heptagon has 7 sides but a pentagon has 5 sides

Q: How many sides does a heptagonal figure have?

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Heptagonal is an adjective, not a noun! The answer will depend on whether you mean a heptagonal pyramid, a heptagonal bipyramid, a heptagonal prism or whatever.

A heptagonal what? Prism, pyramid or something else?

Well if you have an 8 sided figure there is obviously 8 sides.

A polygon is a figure with 3 or more sides.

7

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Heptagonal is an adjective, not a noun! The answer will depend on whether you mean a heptagonal pyramid, a heptagonal bipyramid, a heptagonal prism or whatever.

50 stupid

Heptagonal prism.

A heptagon is a figure with 7 sides. Also, if by corner you mean edges, we can find that. There's the edges of the heptagonal base. So there's 7. Then we have the edges of where the lateral faces meet each other. There's another 7. You have 14 edges in a heptagonal pyramid. If, in fact, you meant "corners", then we add in the vertex (or apex) of the pyramid. Then you will have 15 "corners".

hexagonal pyramid

Heptagonal prism

Heptagonal is an adjective: the answer depends on the noun that it refers to. A heptagonal pyramid, a heptagonal dipyramid or a heptagonal prism or some other heptagonal shape?

A heptagon is a 7-sided polygon, so a heptagonal prism is a 3D version of that (9 sides, 21 edges, 14 vertices).

there is 13 edges in a heptagonal pyramid.

a heptagonal pyramid has 8 faces

A heptagonal prism has two 7-sided bases.

A heptagonal what? Prism, pyramid or something else?