Estimating and Costing
The correct Prismoidal formula for volume is

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

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