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)
B. 2R (θ + tan θ)
C. R (θ + cos θ)
D. 2R (θ + cos θ)
Answer: Option D
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its 2R(theta plus cot theta)