A circular swimming pool is 21 feet in diameter. What is the circumference of the swimming pool?

1 Answer
Jun 7, 2017

The circumference is #21pi# feet or #66# feet.

Explanation:

The formula for circumference of a circle is:

#C=pid#, where #C=#Circumference, and #d=#diameter.

#C=pixx21#

Consider #pi=22/7#

#C=22/7xx21#

#C=22/(1cancel7)xx3cancel21#

#C=22xx3#

#C=66#