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Solving Circle Problems

Total questions: 10

Worksheet time: 10mins

Name
Class
Date
1.

The circumference of a circle is 36.31 meters. What is the approximate length of the radius? Use 3.14 for π.

a)

3 m

b)

4 m

c)

5 m

d)

6 m

2.

The circumference of a circle is 18.41 feet. What is the approximate length of the radius? Use 3.14 for π.

a)

3 ft

b)

5 ft

c)

7 ft

d)

8 ft

3.

The radius of a birthday cake is 4 inches. Icing will decorate the circumference of the cake. What procedure can be used to find the approximate circumference of the cake? Use 3.14 for π.

a)

Multiply 4 by 3.14.

b)

Multiply 4 by 2, and then multiply the product by 3.14.

c)

Multiply 4 by 4, and then multiply the product by 3.14.

d)

Divide 4 by 2, and then multiply the quotient by 3.14.

4.
What is the diameter?
a)
8
b)
16
c)
10
d)
4
5.
What is the radius?
a)
18
b)
72
c)
38
d)
14
6.
The radius is....
a)
a line that crosses through the center and touches each edge 
b)
the center point of a circle 
c)
a line from the center point to the edge of the circle
d)
an element in science
7.
After taking part in a competition, Yahir received a bronze medal with a radius of 2.5 inches. What is the medal's diameter?
a)
2.5 in
b)
5 in
c)
4 in
d)
4.5 in
8.
Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?
a)
11.32 ft
b)
12.25 ft
c)
10.99 ft
d)
8.75 ft
9.

What is the approximate area of the circle above? Answer in 1 decimal places.

a)

44 inches squared

b)

154 inches squared

c)

616 inches squared

10.

The diameter of a circle is 8 cm. What is the approximate area of the circle?

a)

25 cm squared

b)

50 cm squared

c)

201 cm squared