The cross-section of a road partly in banking and partly in cutting is shown in Fig. The area of the shaded portion is

- 1
  
  (1/2) x (b-rd)^2 / (r-s)
- 2
  
  (1/3) x (b-rd)^2 / (r-s)
- 3
  
  (1/2) x (b+rd)^2 / (r-s)
- 4
  
  (1/3) x (b-rd)^2 / (r-5)

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