Question #39e7f

2 Answers
Soul of Fire
Jan 9, 2018

#4pi#

Explanation:

The formula for the circumference of a circle with radius r is #2rpi#. We replace r with #2# to get #2*2pi=4pi#.

So the answer is #4pi#.

Christian J.
Jan 9, 2018

#2pi(2) = 4pi ~~ 12.566#

Explanation:

The equation to calculate the circumference of a circle is #2pir# or #pid# (they are the same since #d = 2r# when d is the diameter and r is the radius.

Therefore, you just need to plug the radius of 2 into the equation #2pir# to find the circumference:
#2pi(2) = 4pi ~~ 12.566#

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