Reynolds number for non-circular cross section is:
[V = mean velocity
v = kinematic viscosity
P = Ratio of cross sectional area to the wetter perimeter]
A] $$\frac{V.4P}{v}$$ B] $$\frac{V.P}{v}$$ C] $$\frac{V.2P}{4v}$$ D] $$\frac{V.P}{4v}$$

A

A only

B

B only

C

C only

D

D only