A prismatic bar is carrying only an axial force. The two planes on which normal and shearing stresses are euqal are inclined to the axial force at angles

- 1
  
  $0 a n d \frac{π}{2}$
- 2
  
  $\frac{π}{4} a n d \frac{3 π}{4}$
- 3
  
  $\frac{π}{6} a n d \frac{2 π}{3}$
- 4
  
  $\frac{π}{3} a n d \frac{5 π}{6}$

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