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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`theta` with horizontal, the perimeter of the canal is



Options:
A .  R(` theta` + tan ` theta`)
B .  2 R(`theta` + tan ` theta`)
C .  R(` theta` + cos` theta`)
D .  2R(` theta` + cos` theta`)
E .  none of these.
Answer: Option D


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