Question

A caircular fountian has a circumference of 21 feet. Which expression can be used to find the diameter of the fountian in feet?​

Answer 1

Answer: $21 = 2\pi r$

Step-by-step explanation:

To find the circumference of a circle, you can use $2\pi r$. You can set this equal to 21 (feet). The equation to solve at this point would be $21=2\pi r$.