1. Do Now 4/17/13 Take out HW from last night. Copy HW in your planner.
Text p. 362, #1-24 all, 27, 32, 33
Copy HW in your planner.
Text p. 366, #7-15 all, 24, 29
Text p. 370, #7-17 all
Quiz sections Friday
In your journal, find the perimeter of the figure below.
8 cm
10 cm

2. Homework Text p. 362, #1-24 all, 27, 32, 33 1) 18 m 2) 24 in. 3) 32 ft
11) 48 cm
12) 30 ft
13) 44 m
14) 26 in.
15) 8 ft
16) 36.4 cm
17) 110 cm
18) 18.8 m
19) 32 in.
20) about 29 in.
21) 2.8 m; 5.7 m
22) 13.4 yd; yd
23) 5.3 in.; in.
24) 1/2; 1
27) 96 ft
32) D
33) 28

3. Objective
SWBAT find the area of a circle and the area of irregular figures

4. Section 9.2 “Area of a Circle”
To find the area of a circle, square the radius of the circle and multiply by pi ( ).
Area =
Radius
Diameter

5. Try It Out!!
Find the area of the following circles.
A) B).
3 m
4 m

6. Find the area of the shaded region of the circle. Use 3. 14 for 
Find the area of the shaded region of the circle. Use 3.14 for  . Round your answer to the nearest hundredth.
The measurement of the radius of the circle is 2.4 cm.
A = r2
2.4 cm
A = 3.14 · 2.42
A  3.14 · 5.76
A  18.09
Since of the circle is shaded, divide the area of the
circle by 4 and subtract the answer from the entire area ÷ 4 = – 4.52 =
3 4
The area of the shaded region of the circle is about cm2.

7. Section 9.3 “Area of Irregular Figures”
Composite Figure
figure that is irregular made up of simple geometric shapes, such as triangles, rectangles, and circles

8. Estimate the area of the figure. Each square represents 1ft².

9. Find the area of the figure. Use 3.14 for pi.
Break the figures apart into simple shapes: circles, rectangles, squares, or triangles. Find the area for each part. Then find the sum.
15 m
35 m
Area
of rectangle
Area of
semi-circles
Total m² m²
701.6 m²

10. Find the area of the figure.
Break the figures apart into simple shapes: circles, rectangles, squares, or triangles. Find the area of each part. Then find the sum.
8 ft
Area of
triangle
Total
Area of
semi-circle
Area of
rectangle
25.12 ft²
ft²
ft²
ft²

11. The foul poles down the 1st and 3rd base lines on a baseball field are 250 feet from home plate. Find the area of the field.
Break the figures apart into simple shapes: circles, rectangles, squares, or triangles. Find the distance around each part.
Area of
quarter-circle

12. 24
Homework
Text p. 366, #7-15 all, 24, 29
Text p. 370, #9-17 all