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February 1, 2015

February 1, 2015

Posted by **kayla** on Monday, May 23, 2011 at 2:35pm.

btw.. thx fer yall tht answer these, aprichiate it. yall are fricken wizards.

- Geometry -
**Reiny**, Monday, May 23, 2011 at 5:27pmA radius to a chord cuts the chord in half at a right angle.

So if the radius is r, I see that

r^2 = 12^2 + 16^2

r^2 = 400

r = √400 = 20

circumference = 2πr = 2π(20) = 40π

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