Five-Minute Check (over Lesson 11–5)

Main Idea and Vocabulary

Example 1:Find the Area of a Composite Figure

Example 2: Real-World Example

• composite figure

• semicircle

• Find the areas of composite figures.

Find the Area of a Composite Figure

Find the area of the figure in square centimeters.

The figure can be separated into a rectangle and a triangle. Find the area of each.

Find the Area of a Composite Figure

Area of Rectangle

A= lw Area of a rectangle

A = 15 ● 10Replace l with 15 and w

with 10.

A = 150Multiply.

Area of Triangle

Find the Area of a Composite Figure

Answer: The area is 150 + 10 or 160 square centimeters.

1. A

2. B

3. C

4. D

A B C D

0% 0%0%0%

A. 82 yd2

B. 108 yd2

C. 119 yd2

D. 172 yd2

Find the area of the figure.

WINDOWS The diagram below shows the dimensions of a window that is 3.4 feet by 7.2 feet. Find the area of the window. Round to the nearest tenth.

The figure can be separated into a semicircle and a rectangle.

Area of Semicircle

Area of Rectangle

A = lw Area of a rectangle

Answer: The area is 18.7 + 4.5 or about 23.2 square feet.

BrainPOP: Area of Polygons

A = 5.5 ● 3.4Replace l with 7.2 – 1.7 or 5.5 and w with 3.4.

A = 18.7Multiply.

1. A

2. B

3. C

4. D

0% 0%0%0%

A. 162.4 ft2

B. 180.3 ft2

C. 220.8 ft2

D. 252.6 ft2

DRIVEWAY The diagram shows the dimensions of a new driveway. Find the area of the driveway. Round to the nearest tenth.

End of the Lesson

Five-Minute Check (over Lesson 11–5)

Image Bank

Math Tools

Area of Trapezoids

Drawing 3-D Figures

Area of Polygons

1. A

2. B

3. C

4. D

0% 0%0%0%

(over Lesson 11-5)

A. 200 ft2

B. 250 ft2

C. 450 ft2

D. 300 ft2

Solve the problem by solving a simpler problem.Mr. Cole decided to build a deck around his swimming pool. His pool is 25 feet by 10 feet and he wants the deck to be 2.5 feet wide. What will the area of the deck be?

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 11-5)

A. $48.28

B. $19.72

C. $20.40

D. $47.60

Solve the problem by solving a simpler problem. Over the weekend, Darrell spent $68. Of that, about 71% was spent on a game. About how much money was not spent on a game?

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 11-5)

A. 72 bracelets

B. 96 bracelets

C. 48 bracelets

D. 144 bracelets

Solve the problem by solving a simpler problem. Becky can make 6 bracelets in 3 days. How many bracelets can she and two friends make in 8 days working at the same rate?

1. A

2. B

3. C

4. D

A B C D

0% 0%0%0%

(over Lesson 11-5)

A. 7

B. 8

C. 9

D. 10

The graph shows the results of the 2006 Winter Olympics. The U.S. received a total of 25 medals. How many were gold?