Learning Resources LRM320B-GUD

= (π r2) ××H

Pyram i d

Introduce the general formula for finding the volume of a pyramid.

Volume pyramid =  A ××H

Ask students to identify the difference between this general formula and the one

for the prism. (There is one more variable: .) If students remember a

volume formula for a prism, it is easy to

remember the volume formula for

a pyramid with the same-size base and

height: simply multiply by . You

can demonstrate this concept by pouring

three filled pyramids into the

corresponding prism in the Geometric

Shapes set.

Square Py ramid

Volume square pyramid =  A ××H

=  ( l ××w) ××H

Triangu lar Pyram id

Volume triangular pyramid =  A ××H

=  ( b ××h) ××H

Cone

Volume cone =  A ××H

=  ( πr2) ××H

Sphe re

Volume sphere =  π r3

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