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In the racetrack shown above, regions I and III are semicircular with radius r. If region II is rectangular and its length is twice its width, what is the perimeter of the track in terms of r?
A. \(2r(\pi+2)\)
B. \(2r(\pi+4)\)
C. \(2r(\pi+8)\)
D. \(4r(\pi+2)\)
E. \(4r(\pi+4)\)
OA B
A. \(2r(\pi+2)\)
B. \(2r(\pi+4)\)
C. \(2r(\pi+8)\)
D. \(4r(\pi+2)\)
E. \(4r(\pi+4)\)
OA B
