# Help!Prisms!

• Jan 7th 2007, 08:51 AM
sarahgasoline
Help!Prisms!
1)The bases of the right prism aare 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 90degrees
d.)all of the above

D, i think?

2)If a prism has a non-rectangular parrallelogram for one of its lateral faces, then it is a __________ prism.
a.)right
b.)oblique
c.)diagonal
d.)rectangular

B?
• Jan 7th 2007, 09:09 AM
ThePerfectHacker
Quote:

Originally Posted by sarahgasoline
1)The bases of the right prism aare triangles. What can be said about the triangles?
a.)the triangular planes are parallel to each other

This is true, that is a way to think of what a prism means.
Quote:

b.)the triangles must be equilateral triangles
Meaning all angles are 60 but that cannot be because the triangles are right.
Quote:

c.)the triangles cannot have any angles larger than 90degrees
This is true, because x+y+90=180 thus, x+y=90 thus, x,y<90
• Jan 7th 2007, 09:58 AM
Soroban
Hello, Sarah!

Quote:

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.