Lesson 10-8 Pages 539-543

Area: Irregular Figures

What you will learn!

How to find the area of irregular figures.

What you really need to know!

To find the area of an irregular figure, separate the irregular figure into figures whose area you know how to find.

Example 1:

Find the area of the irregular figure to the nearest tenth.

Example 1:

There is a square, a triangle, and a quarter of a circle.

4)(

2

1

2

ra

bha

lwa

Example 1:

There is a square, a triangle, and a quarter of a circle.

4)2(

422

1

22

2

a

a

a

Example 1:

There is a square, a triangle, and a quarter of a circle.

1.3

4

4

a

a

a

Example 1:

There is a square, a triangle, and a quarter of a circle.

21.11 in

Example 2:

Carpeting cost $2 per square foot. How much will it cost to carpet the area shown?

There are two rectangles and one triangle.

Example 2:

bha

lwa

lwa

2

1

Example 2:

12142

1

33

1014

a

a

a

Example 2:

84

9

140

a

a

a

Example 2:

2233 fta

$2 x 233ft2 =

$466

Page 541

Guided Practice

#’s 3-6

Pages 539-541 with someone at home and

study examples!

Read:

Homework: Pages 542-543

#’s 7-10, 16-22

#’s 26-35

Lesson Check Ch-10

Study Guide and Review

Pages

544-548

#’s 1-33(Odd answers in back of book)

Prepare for Test!

Page

549

#’s 1-20 Lesson CheckCh-10

Prepare for Test!

Pages

550-551

#’s 1-19

#16 Ch Test 2A

Page

750

Lesson 10-8

D’E’

F’G’

E’

F’

G’

H’

X’W’

Y’Z’

8ft

12 ft more

4ft

16 ft

4 ft

A = r2

A = 162

A 804 ft2

A = r2

A = 42

A 50 ft2

804 – 50 = 754 ft2

3 units 1 unit

9u2

1u2

9 : 1