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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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