Question

If a circle has a diameter of 21 inches, what is the circumference? (Use 22/7 for π.)

Answer 1

Answer: 66 is the circumference

Step-by-step explanation: Formula of circumference: 2 times pi times R

R is radius and Diameter is 2 times of R. Formula of circumference can also be: pi times R. 22/7 times 21 is 66.