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If straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle `theta` with horizontal, the area of its cross-section, is



Options:
A .  R(` theta` + tan ` theta`)
B .  R(` theta` + cot ` theta`)
C .  R2(` theta` + tan ` theta`)
D .  R2(` theta` + cot ` theta`)
E .  R(` theta` - tan ` theta`)
Answer: Option D


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