Applied Mechanics and Graphic Statics
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

(a² + ab + c²)/3 (a + c)
(a² + ab + b²)/3 (a + b)
None of these
(b² + bc + c²)/3 (b + c)

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