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January 31, 2015

January 31, 2015

Posted by **matt** on Friday, December 10, 2010 at 8:30am.

- geometry -
**Reiny**, Friday, December 10, 2010 at 10:02amarc-length = rß where ß is in radians

pi/2 = 2ß

ß= pi/4 radians, which is 45 degrees

or

the whole circumference would be 2(pi)r

= 4pi

now by a simple ratio ....

(1/2)pi/(4pi) = angle/360

4angle = 180

angle = 45

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