Irrigation - Engineering

Q1:

If straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the area of its cross-section, is

A R(θ + tan θ)

B R(θ + cot θ)

C R2(θ + tan θ)

D R2(θ + cot θ)

E R(θ + tan θ)

ANS:D - R2(θ + cot θ)

The perimeter of the canal is 2R(θ + cosθ).