Page 44 - Math Course 3 (Book 2)

Volume of Pyramids, Cones, and Spheres
Mo. 8

Lesson 1 Volume of a Cone

Words The volume V of a cone with radius r is
one-third the area of the base B time the
KEY CONCEPTS: the height h.

1. Find volumes of pyramids. 1 1
2. Find volumes of cones and spheres. Symbols V = Bh or V = π²h, where B = π²
3
3
Model

MO. 8 - L1a h

Find Volume of Pyramids, r
Cones, and Spheres

Volume of a Sphere
Vocabulary A-Z Words The volume V of a sphere is four-thirds
Let us learn some vocabulary times pi times the radius cubed.

1
sphere Symbols V = π³
A sphere is a set of points in space that are a given 3
distance r from the center. Model r

r

Let’s Begin

Volume of a Pyramid
Key Concept Example

Volume of Pyramid Find the volume of the pyramid. Round to the

nearest tenth if necessary.
Words The volume V of pyramid is one -third the
area of the base B times the height h.

1
Symbols V = Bh
3
12 in.
Model

h 15 in.

B 15 in.

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