Name:_________________________________
M3L20
Date:_________
Accordino-Math 7
Period:________
Lesson 20: Composite Area
Bellringer
Use the circle below to answer questions 1-3:
Diameter =4 cm
1) Which represents the radius of the circle?
a. 2 cm
b. 4 cm
c. 1 cm
d. 8 cm
2) Which below represents the circumference of the circle to the nearest hundredth?
a. 𝐶 = 12.57𝑐𝑚
b. 𝐶 = 6.28𝑐𝑚
c. 𝐶 = 50.27𝑐𝑚
d. 𝐶 = 12.57𝑐𝑚2
3) Which of the following represents the area of the circle in terms of  ?
a.
b.
c.
d.
A  4cm 2
A  4cm
A  16cm 2
A  16cm
Name:_________________________________
M3L20
Accordino-Math 7
Date:_________
Period:________
Lesson 20: Composite Area
Notes
Review:
Area formulas:
Rectangle ____________________
Square _____________________
Triangle _____________________
Circle _____________________
Composite Area = __________________________________________________________________
Example 1:
Find the area of the shaded region. Round to the nearest tenth.
Name:_________________________________
M3L20
Accordino-Math 7
Date:_________
Period:________
Example 2:
Find the area of the shaded region. Round to the nearest tenth.
Example 3:
Jillian is making a paper flower motif for an art project. The flower she is making has four petals; each petal is formed by
three semicircles as shown below. What is the area of the paper flower? Round to the nearest hundredth.
Name:_________________________________
M3L20
Accordino-Math 7
Date:_________
Period:________
Example 4:
A yard is shown with the shaded section indicating grassy areas and the unshaded sections indicating paved areas. Find
2
the area of the space covered with grass in units .
SUPER MATHIE!
Find the area of the shaded region. The figure is not drawn to
scale.
Name:_________________________________
Accordino-Math 7
M3L20
Date:_________
Period:________
Homework:
1.
The figure shows two semicircles. Find the area of the shaded region. Round to the nearest tenth.
2.
The figure shows a semicircle and a square. Find the area of the shaded region. Round to the nearest hundredth.
3.
The figure shows two semicircles and a quarter of a circle. Find the area of the shaded region. Round to the nearest
tenth.
4.
Jillian is making a paper flower motif for an art project. The flower she is making has four petals; each petal is
formed by three semicircles as shown below. What is the area of the paper flower? Round to the nearest
hundredth.
1.
Name:_________________________________
Accordino-Math 7
5.
M3L20
Date:_________
Period:________
The figure is formed by five rectangles. Find the area of the unshaded rectangular region.
Review:
Name:_________________________________
Accordino-Math 7
M3L20
Date:_________
Period:________
Lesson 20: Composite Area Problems
Exit Ticket
1)
Find the area of the shaded region.