Posted by **Emily** on Wednesday, March 7, 2007 at 9:00am.

If the radius of a circle is x/6, what's the diameter and circumference?

Diameter = 2*r

Circumference = 2*pi*r

...or...

Circumference = pi*d

Note: I'm using * to mean multiply.

Can you now determine what you need to know with this information?

Not really. I just need to know how you can take the fraction x/6 and multiply it by two. How do you get an answer of 0.3?

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