If R is the rise, T is the tread and W is the weight of waist slab on the slope, then the equivalent weight on the horizontal plane will be equal to

- 1
  
  $\frac{W (R + T)}{T}$
- 2
  
  $\frac{W . T}{R + T}$
- 3
  
  $\frac{W \sqrt{R^{2} + T^{2}}}{T}$
- 4
  
  $\frac{W \sqrt{R^{2} + T^{2}}}{R}$

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