SOLUTION: I am having trouble in my college geometry class. The problem is as follows: Find the circumference and area of the circle whose equation is x^2 + y^2 =36. Round to the nearest

Algebra ->  Circles -> SOLUTION: I am having trouble in my college geometry class. The problem is as follows: Find the circumference and area of the circle whose equation is x^2 + y^2 =36. Round to the nearest       Log On


   

Question 297798: I am having trouble in my college geometry class. The problem is as follows:
Find the circumference and area of the circle whose equation is x^2 + y^2 =36. Round to the nearest tenth.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2+%2B+y%5E2+=+36
When x+=+0,
y+=+6 and
y+=+-6
also
When y+=+0
x+=+6 and
x+=+-6
So, the diameter is 6+-+%28-6%29+=+12
measured along either axis, and the radius is
12%2F2+=+6
Just plug this into
A+=+pi%2Ar%5E2
and C+=+2%2Api%2Ar