A three hinged semicircular arch of radius $R$ carries a uniformly distributed load $' W'$ per unit run over the whole span.

The horizontal thrust is

- 1
  
  $W R$
- 2
  
  $W R / 2$
- 3
  
  $- \frac{4}{3 π} W R$
- 4
  
  $\frac{2}{3 π} W R$

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