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Mathematics 15 Online
OpenStudy (anonymous):

Dan Perkin's goat attached to the corner of the 18-foot pump house by an 18-foot length of rope. the goat eats the grass around the pump house as shown in the diagram. this pattern consists of three-fourths of a circle of radius 18 feet and one-fourth of a circle of radius 9 feet. what area of grass can Dan Perkins goat eat?(use n=3.14 as an approximate value.)

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