If $F_{r}$ is the Froude number for a flow in a triangular channel, then the Froude number for same velocity and same depth of flow in rectangular channel will be

- 1
  
  $F_{r}$
- 2
  
  $\frac{F_{r}}{\sqrt{2}}$
- 3
  
  $\sqrt{2 F_{r}}$
- 4
  
  $\frac{F_{r}}{\sqrt{3}}$

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