The area of the cross-section of a road fully in banking shown in Fig. is

- 1
  
  (sb^2+r^2(2bd+Sd^2)) / r^2 - S^2
- 2
  
  (Sb^2+r^2(2bd-Sd^2)) / r^2 - S^5
- 3
  
  (sb^2+r^2(2bd+sd^2)) / r - s
- 4
  
  (sb^2+r^2(2bd+Sd^2)) / r - S

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