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Q&A #19289 |
From: Jeanne
(for Teacher2Teacher Service)
Date: Jan 26, 2008 at 16:58:42
Subject: Re: Geometry attributes
Hi Mrs. D., Actually, a base is a face -- a special face. The triangle prism has 2 bases: the triangular faces. The lateral faces are parallelograms. Most of the time elementary school children work with RIGHT prisms where each base meet each lateral face at right angles. In RIGHT prisms, the lateral faces are rectangles. Pattern blocks contain examples of different types of right prisms. The bases include hexagons, trapezoids, equilateral triangles, 2 different rhombuses. For an example of a prism whose lateral faces are not rectangles, take a stack of index cards or a deck of playing cards and slide the cards so that 2 opposite faces form a parallelogram. (Hopefully, the sketch I've created for you below holds its spacing.) *--------* *--------* *--------* ===> *--------* *--------* *--------* The deck is still a prism -- a skewed prism. If you want you can slide the cards so that none of the lateral faces form right angles with the bases. From a single deck of cards you can form 1 right and 2 different types of skewed prisms. Hope this helps! -Jeanne, for the T2T service
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