Maximum shear stress in circular cross-section is

where $q_{a v}$ is average shear stress

- 1
  
  $\frac{9}{8} q_{a v}$
- 2
  
  $\frac{4}{3} q_{a v}$
- 3
  
  $\frac{3}{2} q_{a v}$
- 4
  
  $\frac{8}{3} q_{a v}$

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