A trapezoidal canal of bottom width B, depth d with a side slope z : 1 – McqOptions

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1.	A trapezoidal canal of bottom width B, depth d with a side slope z : 1 (horizontal : vertical) is formed in cutting for a length of L. It is proposed to provide lining to the canal. The surface area of lining the canal is:
A.	\(L\left( {B + 2d\sqrt {z + 1} } \right)\)
B.	\(L\left( {B + 2d\sqrt {{z^2} + 1} } \right)\)
C.	\(2L\left( {B + d\sqrt {{z^2} + 1} } \right)\)
D.	L(B + 2 z d)
Answer» C. \(2L\left( {B + d\sqrt {{z^2} + 1} } \right)\)

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