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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

R(θ + tan θ)
2R(θ + tan θ)
R(θ + cos θ)
2R(θ + cos θ)
none of these.

Correct Answer: 2R(θ + cos θ)

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