Engineering :: Fluid Mechanics and Hydraulic Machines

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The most economical section of a triangular channel is

[A].	A right angled triangle	[B].	An equilateral triangle
[C].	An isosceles triangle with vertex angle of 45?	[D].	An isosceles triangles with vertex angle of 60?
[E].	An isosceles triangle with vertex angle of 90?

Answer: Option E