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

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Estimating and Costing
The correct Prismoidal formula for volume is

D/3 [first area + last area + 4 Ʃ Even area + 2 Ʃ odd areas]
D/3 [first area + last area + 2 Ʃ Even area + 4 Ʃ odd areas]
D/6 [first area + last area + 2 ∑ Even area + 4 ∑ odd areas]
D [first area + last area + Ʃ Even area + 2 Ʃ odd areas]

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