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= (π r
2
)
××
H
Pyramid
Introduce the general formula for finding the volume of a pyramid.
Volume
p
yramid
= 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
Triangular Py ramid
Volume
triangular pyramid
= A
××
H
= ( b
××
h)
××
H
Cone
Volume
cone
= A
××
H
= (π r
2
)
××
H
Sphere
Volume
sphere
= π r
3
7
H
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b
h
H
w
l
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r
r
H
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r