Estimating and Costing
The cross-section of a road partly in banking and partly in cutting is shown in the given figure. The area of the shaded portion is

⅓ × (b - rd)²/(r - s)
⅓ × (b - rd)²/(s - r)
½ × (b + rd)²/(r - s)
⅓ × (b - rd)²/(r + s)

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