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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