Circles/Circumference/Area Test
Submitted by Amy Beavers
MAED 5040-5070-8B
July 11, 2011
Circles Test
Circumference/Area
Calculator Active
Name _________________________
Clearly label the following in the circle to the right.
1.
2.
3.
4.
Point B as the center
Diameter AC
Radius BD
Chord EF
Find the following. Show all work. Round each answer to the tenths
place and use 3.14 for pi when necessary.
5. A circle has a radius of 12 inches. Find:
a.)
The diameter of the circle
b.) The circumference of the circle
c.)
The area of the circle
6. A circle has a diameter of 1.8 kilometers. Find:
a.)
The radius of the circle
b.) The circumference of the circle
c.)
The area of the circle
Choose the correct answer for each of the following problems. Show
all work. Use 3.14 for pi.
7. What expression would you use to find the area of a circle with a
diameter of 24?
a. 3.14(24)(24)
b. 3.14(24)
c. 3.14(12)(12)
d. 3.14(12)
8. What expression would you use to find the area of a circle with a
radius of 2?
a. 3.14(2)(2)
b. 3.14(1)(1)
c. 3.14(2)
d. 3.14(1)
9. Tom wants to cover the top of a circular table with material. The
diameter of the table is 18 inches. How many square inches of
material are needed?
a. 254.34 in.2
b. 56.52 in.2
c. 1,017.36 in.2
d. 508.68 in.2
10. What is the circumference of this circle?
a.)
b.)
c.)
d.)
45.3416 cm.
181.3664 cm.
23.864 cm.
11.932 cm.
11. The circumference of a circle is 10.99 inches. What
is the diameter of the circle?
a. 1.75 in.
b. 3.5 in.
c. 7 in.
d. 5.495 in.
7.6 cm.
Solve each problem. Round answers to the tenths place and use 3.14 for
pi. Show all work.
12. Joe’s cow is tied to a post with a piece of rope that is
15 feet long. What is the area in which the cow can
graze?
13. A round game table has a diameter of 1 m. How
much plastic laminate is needed to cover the top of
the table?
14. The diameter of the earth at the equator is about
8,000 mi. Based on this figure, how far is it around
the earth?
15. Radio Station KROQ broadcasts in all directions to a
distance of 40 miles. How many square miles are in
the station’s broadcast area?
16. World Record: The world’s largest Ferris Wheel
was built in London in 1897. The wheel had a
radius of 150 feet. How far would you travel in one
turn of this wheel?
Student Answer Sheet
Circles Test
Circumference/Area
Name _________________________
Clearly label the following in the circle to the right.
1. Point B as the center
2. Diameter AC
3. Radius BD
4. Chord EF
Find the following. Show all work. Round each answer to the tenths
place and use 3.14 for pi when necessary.
5a.
Diameter = _________
5b. Circumference =
________
5c.
Area = ________
6a.
Radius = ________
6b. Circumference =
________
6c.
Area = ________
Name _________________________
Choose the correct answer for each of the following problems. Show
all work. Use 3.14 for pi.
7.
8.
9.
______ Answer
______ Answer
______ Answer
10.
11.
______ Answer
______ Answer
Name _________________________
Solve each problem. Round answers to the tenths place and use 3.14 for
pi. Show all work.
12.
13.
14.
____________ Answer
____________ Answer
____________ Answer
15.
16.
____________ Answer
____________ Answer
Answer Key
Circles Test
Circumference/Area
Clearly label the following in the circle to the right.
Check circle for each of the following.
1. Point in center labeled B
2. Line segment AC going all the way
across the circle and passing through the
center point
3. Line segment BD going from the center
to the outside of the circle
4. Line segment EF having both endpoints on the
circle.
Find the following. Show all work. Round each answer to the tenths
place and use 3.14 for pi when necessary.
5a.
Diameter = 24 in.
5b. Circumference =
75.4 in.
5c.
Area = 452.2 in.2
diameter = radius(2)
12(2)
C = pi(diameter)
3.14(24)
75.36
A = pi(r2)
3.14(122)
452.16
6a.
Radius = 0.9 km.
6b. Circumference =
5.7 km.
6c.
Area = 2.5 km.2
radius = diameter/2
1.8/2
0.9
C = pi(diameter)
3.14(1.8)
5.652
A = pi(r2)
3.14(0.92)
2.5434
Name _________________________
Choose the correct answer for each of the following problems. Show
all work. Use 3.14 for pi.
7.
8.
If d = 24, then r = 12.
9.
If d = 18, then r = 9.
Area = pi(r2)
3.14(122) or
3.14(12)(12)
Area = pi(r2)
3.14(22) or
3.14(2)(2)
Area = pi(r2)
3.14(92)
254.34
C Answer
A Answer
A Answer
10.
11.
d = 7.6
C = pi(d)
3.14(7.6)
23.864
C = pi(diameter)
10.99 = 3.14(d)
10.99/3.14 = d
d = 3.5
C Answer
B Answer
Name _________________________
Solve each problem. Round answers to the tenths place and use 3.14 for
pi. Show all work.
12.
13.
14.
r = 15
If d = 1, then r = 0.5.
Area = pi(r2)
3.14(152)
706.5
Area = pi(r2)
3.14(0.52)
0.785
C = pi(d)
3.14(8000)
25,120
706.5 ft.2 Answer
0.8 m.2 Answer
25,120 mi. Answer
15.
16.
r = 40
If r = 150, then d = 300.
Area = pi(r2)
3.14(402)
5,024
C = pi(d)
3.14(300)
942
5,024 mi.2 Answer
942 ft. Answer