Arcs & Sectors

Length of Arcs & Area of Sectors

Let's Review Degrees, Radians, Arc Lengths and Sector Areas

Converting Radians & Degrees

• Degrees x  $\frac{\pi}{180}$  = Radians

• Radians x  $\frac{180}{\pi}$  = Degrees

Lengths of Arcs

• Formula --> $s=r\theta$  

•  $\theta$  must be in radian form

• OR use other form of equation shown to the right ------------->

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Area of Sectors

• Formula --> $A=\frac{1}{2}r^2\theta$  

•  $\theta$  must be in radian form

• OR use other formula to right -->

Fill in the Blanks