If the overall length of a combined footing is L, area of base of footing is A, and the distance between thr centre of base and the centre of gravity of the base is d, then the smaller width (c) for the trapezoidal base of the footing is equal to

- 1
  
  $\frac{A}{L} + \frac{6 A d}{L^{2}}$
- 2
  
  $\frac{A}{L} - \frac{6 A d}{L^{2}}$
- 3
  
  $\frac{L}{A} + \frac{L^{2}}{6 A d}$
- 4
  
  $\frac{L}{A} - \frac{L^{2}}{6 A d}$

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