SOLUTION: The entrance hall of an office building is constructed in the shape of a sector with a 17-ft radius and a 120 degree central angle. How many sq. yards of carpet should be purchased

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Question 1197553: The entrance hall of an office building is constructed in the shape of a sector with a 17-ft radius and a 120 degree central angle. How many sq. yards of carpet should be purchased? Round your answer to 2 decimal places if necessary.
Found 2 solutions by ewatrrr, ikleyn:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi  
stage: in the shape of a sector with a 17-ft radius and a 120 degree central angle.
120°/360° = 1/3 
That is: Area of the stage is  (1/3) of the circular area +pi%2817ft%29%5E2
+%281%2F3%29pi%2817ft%29%5E2 = 302.64 ft^2
____________
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Wish You the Best in your Studies.


Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.

The area of the hall = %28R%5E2%2Aalpha%29%2F2,  where alpha  is the central angle in radians.


alpha = 2%2Api%2A%28120%2F360%29 = %282%2F3%29%2Api = %282%2F3%29%2A3.14 = 2.093333333 radians,  therefore


the area of the hall = %2817%5E2%2A2.093333333%29%2F2 = 302.4867 square feet  (rounded).   ANSWER

Solved.