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.

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