If B is the width of formation.d is the height of the embankment side slope S:1,for a highway with no transverse slope,the area of cross-section is

- 1
  
  B+d+Sd
- 2
  
  Bd+ $S d^{2}$
- 3
  
  Bxd- $S d^{1 / 2}$
- 4
  
  1/2(Bd+ $S d^{2}$ )

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