



 
Hi, I don't see where you obtained θ in part 1. I would have used the law of cosines to determine the angle AOB. In part 2. the area of a sector with central angle θ expressed in radians is 1/2 r^{2} θ and you know θ from part 1. I agree with your answer in part 3. The answer to part 4. is the difference between the area of the sector (part 2.) and the area of the triangle (part 3.). Penny  


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