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May 22nd, 2014, 06:36 PM   #1
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Math Focus: Geometry
Convert angle to radian.

$\displaystyle C_A = \alpha \times r$ : arc length

$\displaystyle A_S = \frac{\alpha \times r^2 }{2}$ : sector area

r is a radius. And $\displaystyle \alpha$ is an angle in radians.

And $\displaystyle 150^\circ$ is $\displaystyle \frac{5 \pi}{12}$, or may be it is not $\displaystyle \frac{5 \pi}{12}$, better check it yourself.
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