SOLUTION: I'm not sure how to solve. It asks "What is the circumference of a circle with the equation x^2 + y^2=81?"

Algebra ->  Circles -> SOLUTION: I'm not sure how to solve. It asks "What is the circumference of a circle with the equation x^2 + y^2=81?"      Log On


   

Question 443902: I'm not sure how to solve. It asks "What is the circumference of a circle with the equation x^2 + y^2=81?"
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
the radius (squared) is in the equation ___ use it (with pi) to find the circumference