The centre of gravity of a trapezoidal dam section whose top width is a, bottom

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The centre of gravity of a trapezoidal dam section whose top width is a, bottom width is band the vertical side is a, from its vertical face is

Options:

A . (a² + ab + b²)/3 (a + b)

B . (b² + bc + c²)/3 (b + c)

C . (a² + ab + c²)/3 (a + c)

D . None of these

Answer: Option A

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