1. Find the volume of the box by determining
Example 1
Find the Volume of a Rectangular Prism
Find the volume of the box by determining
how many unit cubes fit in the box.
SOLUTION
The base is 5 units by 3 units. So, 3 · 5, or 15 unit cubes are needed to cover the base layer.
There are 4 layers. Each layer has 15 cubes. So, the total number of cubes is 4 · 15, or 60.
ANSWER
The volume of the box is 60 cubic units. 1

2. Find the volume of the prism.
Example 2
Find the Volume of a Prism
Find the volume of the prism. a. b.
SOLUTION a.
V = Bh
Write the formula for volume of a prism.
= (7 · 4) · 5
Area of rectangular base = l · w = 7 · 4.
= 140
Simplify.
ANSWER
The volume is 140 cubic inches. 2

3. Write the formula for volume of a prism. Area of triangular base =
Example 2
Find the Volume of a Prism b.
V = Bh
Write the formula for volume of a prism.
Area of triangular base = 1 2 –
· 8 · 6. =
· 8 · 6 · 3
= 72
Simplify.
ANSWER
The volume is 72 cubic feet. 3

4. Find the volume of the prism.
Checkpoint
Find Volume of Prisms
Find the volume of the prism. 1.
ANSWER
216 ft3 2.
ANSWER
125 cm3 3.
ANSWER
245 in.3