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A 4-sided pyramid, also known as a square pyramid, has 8 edges. This is the more-common shape for pyramidal structures. There are 4 edges where the triangular sides meet each other, and there are 4 more edges where the 4 triangular sides meet the square base.

A 3-sided pyramid would have 6 edges; there are 3 triangular sides meeting each other and meeting a triangular base.
As each vertex of the base polygon of the pyramid is connected to the apex of the pyramid, there are twice the number of edges in the base polygon, that is:

number_of_edges_in_pyramid = 2 x number_of_sides_in_base_polygon
5 sides

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9y ago

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