What is the area of the shaded sectora. 55 ft2b. 7.3 ft2c. 86.9 ft2d. 651.9 ft2?

What is the area of the shaded sectora. 55 ft2b. 7.3 ft2c. 86.9 ft2d. 651.9 ft2?
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extra info:the radius is 15 ftand the arc or angle measure is 28 degrees
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