SOLUTION: The length of arc abc is 45 pi inches what is the radius of the circle ? And the arc is 100o

Algebra ->  Circles -> SOLUTION: The length of arc abc is 45 pi inches what is the radius of the circle ? And the arc is 100o       Log On


   

Question 857075: The length of arc abc is 45 pi inches what is the radius of the circle ? And the arc is 100o
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
S=r%2Atheta
Convert the angle to radians.
45%2Api=r%2A%28100%2A%28%282%2Api%29%2F360%29%29%29
45=%2820%2F36%29%2Ar
r=%2845%2A36%29%2F%284%2A5%29
r=9%2A9
r=81inches