Yes.
Yes
Yes
12 edges
9
5
It is three times the number of sides on a base of the prism.
A triangular prism has two bases which are, well, triangles. They are connected by straight edges. Please see the related links.
Yes.
Yes because there are 12 edges in a prism and 12 is indeed a multiple of 3
all of its edges are straight
None. A prism can have only straight edges.
12 edges
no
3
9
12
They are straight lines.
There are twelve edges in a rectangular prism.
for any prism , number of ___ + number of vertices = number of edges + ___