how can you tell the face and base apart ? on a triangular pyramid for a 4th grader
how can you tell the face and base apart on traingular pyramid
It would depend on the type of pyramid.
If it was equilateral (that is, all edges were the same), it wouldn't matter - something like identifying the base of a cube. (Trivia - this would also be called a tetrahedron)
If it was isoceles - that is, the edges of faces were the same - then I would take the base to be the one that had all three edges the same length, and the faces would be the ones with only two equal sides.