Hello, Sarah!

1)The bases of the right prism are triangles.

What can be said about the triangles?

(a) the triangular planes are parallel to each other

(b) the triangles must be equilateral triangles

(c) the triangles cannot have any angles larger than 90°

(d) all of the above

A *right* prism has lateral faces perpendicular to the bases.

. . Think of a wedge of cheese. Code:

*
| * *
| * *
| * *
| * * |
| * * |
| * |
* | |
* | |
* | |
* | *
* | *
* | *
*

(a) is true.

. . The triangular bases are congruent and parallel.

But they can be of *any* type of triangle,

. . not necessarily equilateral or acute.