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If the straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the perimeter of the canal is. | |
A. | R(θ + tan θ) [Wrong Answer] |
B. | 2R(θ + tan θ) [Wrong Answer] |
C. | R(θ + cos θ) [Wrong Answer] |
D. | 2R(θ + cos θ) [Correct Answer] |