Question

A custodian carries a large key ring. The key ring has a radius of 4 centimeters. What is the key ring's circumference?

Answer 1

The circumference of the key ring is 8π centimeters.

Step-by-step explanation:

The circumference of a circle can be calculated using the formula:
C = 2πr

Given that the radius of the key ring is 4 centimeters, substitute this value into the formula:
C = 2π(4) = 8π centimeters.

Therefore, the circumference of the key ring is 8π centimeters.