pyramid with a triangular base! gee, don't view w/o posting.

A tetraeder.

Whim

Second post. Math forum:

figure this out:

For a pyramid with a triangular base, such that all triangles in the pyramid are congruent, a quadrilateral is formed with each side connecting the midpoints of a face (or base) of the pyramid. Each face(or base) contains only one side of the quadrilateral. What kind of quadrilateral is formed?

i'm stumped



Answer from Riddles.
Riddles rule.

Isn't that just the German word for tetrahedron?