Posted by **jon** on Wednesday, December 16, 2009 at 8:01pm.

I'm asked to find the circumference of a circle to the nearest tenth and the area of the same circle to the nearest hundredth. The circle has a diameter of 30 and a radius of 15. I got a circumference of 94.2 and an area of 188.48cm2 with these formulas: C=2piR and A=piR2.

Is this correct?

- math -
**bobpursley**, Wednesday, December 16, 2009 at 8:06pm
No, not hardly

Do the area (paste this into your google search window)

PI*15^2

Then the circ..

PI*30

and you were right on that.

- math -
**Marth**, Wednesday, December 16, 2009 at 8:06pm
The circumference looks good, but you may want to check the area calculations. (15^2 = 225)

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