Notes S2 #21 12.5 Volume of Pyramids and Cones.notebook
February 20, 2015
12.5 - Volumes of Pyramids and Cones
Warm­up #29
Obj.:To find the volumes of pyramids and cones
t tha
er ys b
height
em lwa
em a
*R e is
*
*
* lum
area of the base
vo u3!
in volume of a pyramid:V =
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Example
Find the volume of the square pyramid.
Steps
1. Determine the shape of the base
2. Find the area of the base
3. Determine the variables
4. Plug into the formula
15 in
Bh
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You Try!
Find the area of the pyramids. Assume the bases are regular.
Round to the nearest tenth if necessary.
2.
1.
7 in
10 cm
6 cm
12 in
15 in
8 cm
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volume of a cone: V =
Bh
orV =
πr2h
height
area of the base
5m
area of the base
Example
Find the volume of the cone.
Mar 15­7:17 AM
You Try!
Find the area of the cones. Round to the nearest tenth if
necessary.
1.
2.
19.5 m
15 in
12 m
26 m
4 in
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Mar 15­7:37 AM
Notes S2 #21 12.5 Volume of Pyramids and Cones.notebook
Example
Find information by backing into the formula.
Use the given measurements to solve for x.
February 20, 2015
You Try!
Find information by backing into the formula.
Use the given measurements to solve for x.
V = 105 cm3
V = 215 m3
x cm
x
13 m
5 cm
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CLOSURE
Surface Area and Volume Foldable
HOMEWORK
pg. 755 8, 9, 11, 12, 17-21 all
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