Posted by Chase on .
Estimate the radius of a circle with the circumference of 272.2 inches. Help me with the steps please?

Math Geo 
rbowh,
C = pi * d
272.2 = pi * d
272.2/pi = d
use 3.14 for pi 
Math Geo 
Ms. Sue,
C = pi * 2r
272 = 3 * 2r
272 = 6r
272/6 = r
45 = r 
Math Geo Ms Sue 
Chase,
Ms Sue,
I understand it now , but my choice answers none are 45? I followed your steps and got the same answer as you.
But your calculations are right.
Choices are :
43.3 in.
136.1 in.
86.7 in.
5887.2 in
So not sure why ? 
Math Geo 
Chase,
hahah never mind I got it. Estimation!
So 43.3 in. is the answer. Forgot. Thanks. 
Math Geo 
Ms. Sue,
Ugghh!
Of course you're right, but I don't like the answer choices with decimals. In my opinion, estimates should not involve decimals. 
Math Geo 
Anonymous,
Answer is 43.3 A