The document is notes from a math class lesson on finding the volumes of cones and pyramids. It includes the objectives of learning the formulas for these volumes. The formulas given are that the volume of a cone is 1/3πr^2h and the volume of a pyramid is 1/3Bh, where B is the area of the base and h is the height. There are examples provided of applying these formulas to find volumes.

1. 12.5 Volume of Cones & Pyramids
HW pg. 832 #4­24 evens
April 21, 2015
Bellwork
Get a cylinder and a prism from the back table.
Find the volume of each.
Put bellwork in homework bin.

2. 12.5 Volume of Cones & Pyramids
HW pg. 832 #4­24 evens
April 21, 2015
12.5 Volume of Pyramids and Cones
Objectives:
1. To use the formulas for the volumes of pyramids & cones.
How is finding the volume of a
cone/pyramid similar to finding the
volume of a cylinder/prism?
A pyramid is a portion of a prism.
A cone is a portion of a cylinder.
The relationship is 1
/3.

3. 12.5 Volume of Cones & Pyramids
HW pg. 832 #4­24 evens
April 21, 2015
**Remember to use the perpendicular height**
Volume of a Cone :
V = 1
/3 πr2
h
Volume of a Pyramid:
V = 1
/3Bh
where B is the area of the base &
h is the height of the pyramid.

4. 12.5 Volume of Cones & Pyramids
HW pg. 832 #4­24 evens
April 21, 2015
Find the volume of the square
pyramid.
7 cm
12 cm
How much ice cream would be atop
a cone with a diameter of 2 in if
the ice cream is 3 inches high?

5. 12.5 Volume of Cones & Pyramids
HW pg. 832 #4­24 evens
April 21, 2015
A trapezoidal pyramid has a
volume of 420 cubic yards. If
the height of the pyramid is 6
yards, what is the area of the
pyramid's base?

6. 12.5 Volume of Cones & Pyramids
HW pg. 832 #4­24 evens
April 21, 2015
12.5 HW
pg. 832
#4-24 evens