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LESSON
12.6
NAME _________________________________________________________ DATE ___________
Practice A
For use with pages 759–765
Use the diagram at the right.
1. Name a chord of the sphere.
D
E
2. Name a segment that is a radius of the sphere.
3. Name a segment that is a diameter of the sphere.
Lesson 12.6
4. Find the circumference of the great circle that contains A and B.
3 in.
C
A
B
5. Find the surface area of the sphere.
6. Find the volume of the sphere.
Find the surface area of the sphere. Round your result to two decimal places.
7.
8.
6m
9.
5.5 in.
6m
6m
12 cm
4 cm
In Exercises 10–13, use the diagram at the right. The center
of the sphere is C and its circumference is 9 inches.
10. What is half of the sphere called?
C
11. Find the radius of the sphere.
12. Find the diameter of the sphere.
13. Find the surface area of half the sphere.
Find the volume of the sphere. Round the result to two decimal places.
14.
15.
6m
16.
5.1 cm6 m
7 in.
17. Earth and Mercury The mean radius of Earth is approximately
6m
2.5 in.
Earth
Mercury
3963 miles. The mean radius of Mercury is 1509 miles. How
does the surface area of Mercury compare to the surface area
of Earth?
1509 mi
3963 mi
86
Geometry
Chapter 12 Resource Book
Copyright © McDougal Littell Inc.
All rights reserved.
LESSON
NAME _________________________________________________________ DATE ___________
12.6
Practice B
For use with pages 759–765
Find the surface area and the volume of the sphere.
1.
3
2
2.
3.
in.
6m
6m
2.8 m
5 cm
Lesson 12.6
Complete the table below. Leave your answers in terms of .
4.
Radius
of sphere
10 mm
Circumference
of great circle
______
Surface area
of sphere
______
Volume
of sphere
______
5.
______
36 in.
______
______
6.
______
______
7.
______
______
2304
cm2
______
______
500
yd3
3
Find the surface area of the solid and the volume of the solid. The cylinder and
cone are right. Round your results to two decimal places.
8.
9.
2 in.
10 in.
12 cm
4 cm
Tennis Ball In Exercises 10 and 11, consider a tennis ball
with a radius of 3.2 centimeters.
3.2 cm
10. Find the surface area and volume of the tennis ball.
11. Tennis balls are often sold in a can of three. Assuming that the
balls are packed tightly so that they touch the lateral side and the
bases, determine the amount of volume in the can that is not taken
up by the tennis balls.
Earth In Exercises 12 and 13, Earth has an equatorial
radius of approximately 3963 miles.
3963 mi
12. Seventy percent of Earth’s surface is covered with water.
Find the approximate surface area of Earth that is water.
13. Find the volume of Earth.
Copyright © McDougal Littell Inc.
All rights reserved.
Geometry
Chapter 12 Resource Book
87