A "pyramid" is a non-specific term refering to a 3-d shape consisting of a base which is a polygon with n sides, and n triangular faces meeting at an apex. Such a pyramid would have 2n edges.
Thus, a triangular pyramid (tetrahedron) has 6 edges; a square based pyramid has 8, etc.
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A pyramid with a polygonal base has as many edges as the number of sides of its base plus the number of edges in the base. A 100-gon pyramid would have 100 edges on its base and an additional number of edges equal to the number of sides of the base, which is also 100. Therefore, a 100-gon pyramid would have 100 + 100 = 200 edges.
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No, it is the other way around. The total number of edges is twice the number of edges on the base.
The number of edges of the triangular pyramid is eight but the number of faces is five.* * * * *Even though put in italics, the answer is wrong. It would have been correct for a square or rectangle based pyramid but NOT a triangular pyramid. The latter has 6 edges (and 4 triangular faces).
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