Given :
The rim of a tire has a diameter of 12 inches.
To find :
What is the circumference of the tire rim?
Solution :
A circle's circumference is given by,
where:
C = circumference;
d = diameter.
Substitute the value of the diameter (12) into this formula :
C = π × 12
C = 37.7 cm
Therefore The circumference is 37.7 cm.