Shear centre of a semi circular arc strip of radius $' r'$ will be at a distance of $X$ from the centre of the arc, Where $' X'$ is equal to

- 1
  
  $\frac{π r}{2}$
- 2
  
  $\frac{2 r}{π}$
- 3
  
  $\frac{4 r}{π}$
- 4
  
  $\frac{π r}{4}$

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