Question

why a pentagonal pyramid having all its edges congruent cannot be a regular polyhedron?

Answer 1

they only have five sides

Answer 2

Answer:

A polyhedron is said to be a regular polyhedron if its faces are made up of regular polygons and the same number of faces meet at each vertex. ... It is not regular because its faces are congruent triangles but the vertices are not formed by the same number of faces.

Step-by-step explanation:

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