What is the area of a sector of a circle with radius 9 cm and central angle 80°?

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Accepted Answer

1. Use the sector area formula: $	ext{Area}=\dfrac{	heta}{360}\pi r^2$.  
2. Substitute $	heta=80$ and $r=9$: $	ext{Area}=\dfrac{80}{360}\pi(9)^2=\dfrac{2}{9}\pi\cdot81$.  
3. Simplify: $\dfrac{2}{9}\cdot81=18$, so area $=18\pi\ 	ext{cm}^2$.  
FINAL_ANSWER: a

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