3 in.

4.5 in.9 in.

3.5 in.

9 ft 7 ft

7 ft

12 ft

18 ft

6 ft

A

B

C

TUTORIALPRACTICE

8-8 Additional PracticeLeveled Practice In 1–3, find the area of the shaded parts.

1. Lucas is planting grass on the shaded portions of the yard. What will be the total area covered by grass?

Part A = = ft2

Part B = 12# = ft2

Part C = 12# = ft2

Total area = ft2 + ft2 + ft2

= ft2

2. What is the total shaded area of the figure below?

15 cm

7 cm8 cm

12 cm A B C

Part A = 12# = cm2

Part B = = cm2

Part C = 12# = cm2

Total shaded area = cm2

3. What is the total area of the shaded portion shown below?

Part A = = ft2

Part B = = ft2

Part C = 12# = ft2

Total shaded area = ft2

4. The block of wood shown at the right is a triangular prism. What is its surface area?

14 ft 13 ft

A B

C

12 ft10 ft 15 ft

Name:

8-8 Solve Problems Involving Surface Area 111

Scan for Multimedia

13 cm

14 cm

9 cm

32 cm

10 m

4 m8 m

9 m

7 m

5 m

4 m

35 cm

64 cm

42 cm

5. Make Sense and Persevere The bottom part of this block is a rectangular prism. The top part is a rectangular pyramid. Kiran wants to cover the block entirely with paper. How much paper does she need?

18 cm

16 cm

14 cm

14 cm

6. Find the surface area of the regular hexagonal prism shown below.

8 in.

27 in.

6.9 in.

7. The height of the rectangular prism measures 64 cm. If the height is increased by 1.5 cm, by how much will the surface area of the box increase?

8. Higher Order Thinking Joseph’s uncle wants to put shingles on the outside walls and solar panel the roof of his barn shown at the right. It costs $2.50 for each square meter of shingles, while solar panels cost $4.00 per square meter. How much will this project cost?

9. The base of the prism shown is an isosceles triangle. What is the surface area, in square centimeters, of this prism?

Assessment Practice

112 8-8 Solve Problems Involving Surface Area