Posted by Chase on Tuesday, April 23, 2013 at 9:06pm.
Estimate the radius of a circle with the circumference of 272.2 inches. Help me with the steps please?

Math Geo  rbowh, Tuesday, April 23, 2013 at 9:08pm
C = pi * d
272.2 = pi * d
272.2/pi = d
use 3.14 for pi

Math Geo  Ms. Sue, Tuesday, April 23, 2013 at 9:14pm
C = pi * 2r
272 = 3 * 2r
272 = 6r
272/6 = r
45 = r

Math Geo Ms Sue  Chase, Tuesday, April 23, 2013 at 9:18pm
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, Tuesday, April 23, 2013 at 9:19pm
hahah never mind I got it. Estimation!
So 43.3 in. is the answer. Forgot. Thanks.

Math Geo  Ms. Sue, Tuesday, April 23, 2013 at 9:22pm
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, Thursday, April 28, 2016 at 9:41pm
Answer is 43.3 A
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