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May 22nd, 2014, 06:36 PM  #1 
Senior Member Joined: Nov 2013 From: Baku Posts: 502 Thanks: 56 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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arc, area, length, sector 
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