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Warm UpMake a sketch of a closed book using two-point perspective.
Course 3
6-6 Volume of Prisms and Cylinders
Course 3
6-6 Volume of Prisms and Cylinders
Math
Warm UpMake a sketch of a closed book using two-point perspective.
Possible answer:
Problem of the Day
You are painting identical wooden cubes red and blue. Each cube must have 3 red faces and 3 blue faces. How many cubes can you paint that can be distinguished from one another? only 2
Course 3
6-6 Volume of Prisms and Cylinders
Course 3
6-6 Volume of Prisms and Cylinders
A prism is a three-dimensional figure named for the shape of its bases. The two bases are congruent polygons. All of the other faces are parallelograms. A cylinder has two circular bases.
Course 3
6-6 Volume of Prisms and Cylinders
If all six faces of a rectangular prism are squares, it is a cube.
Remember!
Height
Triangular prism
Rectangular prism
Cylinder
Base
Height
Base
Height
Base
Course 3
6-6 Volume of Prisms and Cylinders
VOLUME OF PRISMS AND CYLINDERSWords Numbers Formula
Prism: The volume V of a prism is the area of the base B times the height h.
Cylinder: The volume of a cylinder is the area of the base B times the height h.
B = 2(5)= 10 units2
V = 10(3)
= 30 units3
B = (22)= 4 units2
V = (4)(6) = 24 75.4 units3
V = Bh
V = Bh
= (r2)h
Course 3
6-6 Volume of Prisms and Cylinders
Area is measured in square units. Volume is measured in cubic units.
Helpful Hint
Find the volume of each figure to the nearest tenth.
Additional Example 1A: Finding the Volume of Prisms and Cylinders
Course 3
6-6 Volume of Prisms and Cylinders
A. A rectangular prism with base 2 cm by 5 cm and height 3 cm.
= 30 cm3
B = 2 • 5 = 10 cm2
V = Bh
= 10 • 3
Area of base
Volume of a prism
Find the volume of the figure to the nearest tenth.
Course 3
6-6 Volume of Prisms and Cylinders
B. 4 in.
12 in.
= 192 602.9 in3
B = (42) = 16 in2
V = Bh
= 16 • 12
Additional Example 1B: Finding the Volume of Prisms and Cylinders
Area of base
Volume of a cylinder
Find the volume of the figure to the nearest tenth.
Course 3
6-6 Volume of Prisms and Cylinders
C.
5 ft
7 ft
6 ft
V = Bh
= 15 • 7
= 105 ft3
B = • 6 • 5 = 15 ft212
Additional Example 1C: Finding the Volume of Prisms and Cylinders
Area of base
Volume of a prism
Find the volume of the figure to the nearest tenth.
Course 3
6-6 Volume of Prisms and Cylinders
A. A rectangular prism with base 5 mm by 9 mm and height 6 mm.
= 270 mm3
B = 5 • 9 = 45 mm2
V = Bh
= 45 • 6
Area of base
Volume of prism
Try This: Example 1A
Find the volume of the figure to the nearest tenth.
Course 3
6-6 Volume of Prisms and Cylinders
B. 8 cm
15 cm
B = (82)
= 64 cm2
= (64)(15) = 960
3,014.4 cm3
Try This: Example 1B
Area of base
Volume of a cylinderV = Bh
Find the volume of the figure to the nearest tenth.
Course 3
6-6 Volume of Prisms and Cylinders
C.
10 ft
14 ft
12 ft
= 60 ft2
= 60(14)
= 840 ft3
Try This: Example 1C
Area of base
Volume of a prism
B = • 12 • 10 12
V = Bh
A juice box measures 3 in. by 2 in. by 4 in. Explain whether tripling the length, width, or height of the box would triple the amount of juice the box holds.
Additional Example 2A: Exploring the Effects of Changing Dimensions
Course 3
6-6 Volume of Prisms and Cylinders
The original box has a volume of 24 in3. You could triple the volume to 72 in3 by tripling any one of the dimensions. So tripling the length, width, or height would triple the amount of juice the box holds.
A juice can has a radius of 2 in. and a height of 5 in. Explain whether tripling the height of the can would have the same effect on the volume as tripling the radius.
Additional Example 2B: Exploring the Effects of Changing Dimensions
Course 3
6-6 Volume of Prisms and Cylinders
By tripling the height, you would triple the volume. By tripling the radius, you would increase the volume to nine times the original.
A box measures 5 in. by 3 in. by 7 in. Explain whether tripling the length, width, or height of the box would triple the volume of the box.
Try This: Example 2A
Course 3
6-6 Volume of Prisms and Cylinders
Tripling the length would triple the volume.
V = (15)(3)(7) = 315 cm3
The original box has a volume of (5)(3)(7) = 105 cm3.
Course 3
6-6 Volume of Prisms and Cylinders
A box measures 5 in. by 3 in. by 7 in. Explain whether tripling the length, width, or height of the box would triple the volume of the box.
Try This: Example 2A
The original box has a volume of (5)(3)(7) = 105 cm3.
Tripling the height would triple the volume.
V = (5)(3)(21) = 315 cm3
Course 3
6-6 Volume of Prisms and Cylinders
A box measures 5 in. by 3 in. by 7 in. Explain whether tripling the length, width, or height of the box would triple the volume of the box.
Try This: Example 2A
Tripling the width would triple the volume.
V = (5)(9)(7) = 315 cm3
The original box has a volume of (5)(3)(7) = 105 cm3.
Course 3
6-6 Volume of Prisms and Cylinders
By tripling the radius, you would increase the volume nine times.
A cylinder measures 3 cm tall with a radius of 2 cm. Explain whether tripling the radius or height of the cylinder would triple the amount of volume.
Try This: Example 2B
V = 36 • 3 = 108 cm3
The original cylinder has a volume of 4 • 3 = 12 cm3.
A cylinder measures 3 cm tall with a radius of 2 cm. Explain whether tripling the radius or height of the cylinder would triple the amount of volume.
Try This: Example 2B
Course 3
6-6 Volume of Prisms and Cylinders
Tripling the height would triple the volume.
V = 4 • 9 = 36 cm3
The original cylinder has a volume of 4 • 3 = 12 cm3.
A section of an airport runway is a rectangular prism measuring 2 feet thick, 100 feet wide, and 1.5 miles long. What is the volume of material that was needed to build the runway?
Additional Example 3: Construction Application
Course 3
6-6 Volume of Prisms and Cylinders
length = 1.5 mi = 1.5(5280) ft
= 7920 ft
height = 2 ft
= 1,584,000 ft3
The volume of material needed to build the runway was 1,584,000 ft3.
width = 100 ft
V = 7920 • 100 • 2 ft3
A cement truck has a capacity of 9 yards3 of concrete mix. How many truck loads of concrete to the nearest tenth would it take to pour a concrete slab 1 ft thick by 200 ft long by 100 ft wide?
Try This: Example 3
Course 3
6-6 Volume of Prisms and Cylinders
V = 20,000(1)
B = 200(100)
= 20,000 ft2
= 20,000 ft3
27 ft3 = 1 yd320,000 27
740.74 yd3
740.74 9
= 82.3 Truck loads
Additional Example 4: Finding the Volume of Composite Figures
Course 3
6-6 Volume of Prisms and Cylinders
Find the volume of the the barn.
Volume of barn
Volume of rectangular
prism
Volume of triangular
prism+=
= 30,000 + 10,000
V = (40)(50)(15) + (40)(10)(50)12
= 40,000 ft3
The volume is 40,000 ft3.
Try This: Example 4
Course 3
6-6 Volume of Prisms and Cylinders
Find the volume of the figure.
3 ft
4 ft
8 ft
5 ft
= (8)(3)(4) + (5)(8)(3)12
= 96 + 60
V = 156 ft3
Volume of barn
Volume of rectangula
r prism
Volume of triangular
prism+=
Lesson QuizFind the volume of each figure to the nearest tenth. Use 3.14 for .
306 in3942 in3
Insert Lesson Title Here
160.5 in3
No; the volume would be quadrupled because you have to use the square of the radius to find the volume.
Course 3
6-6 Volume of Prisms and Cylinders
10 in.
8.5 in.3 in.
12 in.12 in.
2 in.
15 in.10.7 in.
1. 3.2.
4. Explain whether doubling the radius of the cylinder above will double the volume.