# Math Geo

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

• Math Geo -

C = pi * d

272.2 = pi * d

272.2/pi = d

use 3.14 for pi

• Math Geo -

C = pi * 2r
272 = 3 * 2r
272 = 6r
272/6 = r
45 = r

• Math Geo Ms Sue -

Ms Sue,

I understand it now , but my choice answers none are 45? I followed your steps and got the same answer as you.

Choices are :

43.3 in.
136.1 in.
86.7 in.
5887.2 in

So not sure why ?

• Math Geo -

hahah never mind I got it. Estimation!

So 43.3 in. is the answer. Forgot. Thanks.

• Math Geo -

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 -

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