If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Area of a circle

Problem

Find the area of a circle with a circumference of 66 units.
Note: Use 227 for π and enter your answer as a fraction.
  • Your answer should be
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
units2