For a vertical semi-circular plate, sub-merged in a homogenous liquid with its diameter 'd' at the free surface, the depth of centre of pressure from the free surface is -

- 1
  
  $\frac{3 πd}{32}$
- 2
  
  $\frac{3 d}{2 π}$
- 3
  
  $\frac{4 d}{3 π}$
- 4
  
  $\frac{3 πd}{16}$

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