SOLUTION: I'm a returning student who was given this problem from retired exam. I have no idea about how to approach and setup the problem which is how I'd like to learn the solution. Your h

Algebra ->  Circles -> SOLUTION: I'm a returning student who was given this problem from retired exam. I have no idea about how to approach and setup the problem which is how I'd like to learn the solution. Your h      Log On


   

Question 1065092: I'm a returning student who was given this problem from retired exam. I have no idea about how to approach and setup the problem which is how I'd like to learn the solution. Your help requested if only to point out the steps to solve. Thank you. A circle with center at (12, -1) passes through (0, -1). Find the circumference and area of the circle in terms of pi
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
I have to find the radius, +r+
Use the length formula for points
( 12, -1 ) and
( 0, -1 )
+r%5E2++=+%28+12+-+0+%29%5E2+%2B+%28+-1+-%28-1%29+%29%5E2+
+r%5E2+=+12%5E2+%2B+%28+-1+%2B+1+%29%5E2+
r%5E2+=+12%5E2+%2B+0+
Take the square root of both sides
+r+=+12+
---------------
Formula for circumference:
+C+=+2%2Api%2Ar+
+C+=+2%2Api%2A12+
+C+=+24%2Api+
Formula for area:
+A+=+pi%2Ar%5E2+
+A+=+pi%2A12%5E2+
+A+=+144%2Api+