If T and R are the tread and rise of a stair which carries a load w per square metre on slope, the corresponding load per square metre of the horizontal area, is

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

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