Question

If a solid consists of three lateral faces and a base that are congruent isosceles triangles, what type of solid is it?

Answer 1

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Answer 2

Do you have any ideas as to what your answer is?

Answer 3

@jonahp

Answer 4

There are only five solids with identical faces which are regular polygons (Platonic solids)
The solid you're looking for is one of them.
Read for example:
http://en.wikipedia.org/wiki/Platonic_solid