1. What is the circumference of a tire with a diameter of 12 inches? A36
B48
C24
D6
2. What is the radius of a circle with a diameter of 20 inches?

A10
B60
C30
D40
3. What is the circumference of a circle with a radius of 12?

A24
B72
C6
D36
4. What is the circumference of a circle with a radius of 7 feet?

A28
B42
C14
D3.5
5. What is the radius of a circle with a diameter of 36 inches?

A6
B18
C12
D16
6. What is the circumference of a circle with a diameter of 30 centimeters?

A60
B90
C50
D15
7. Is the diameter of a tire less than, greater than, or equal to its circumference?

Aequal
Bnot enough information
Cless than
Dgreater than
8. What is the diameter of a tire with a radius of 11 inches?

A22
B33
C5.5
D121
9. Your favorite CD has a radius of 9 centimeters. What is the circumference of the CD?

A18
B4.5
C27
D54
10. Which is true about the radius and diameter?

AThe radius and diameter can sometimes be equal.
BThe diameter is two times the size of the radius.
CThe diameter is half the size of the radius.
DThe radius is two times the size of the diameter.