Estimating and Costing
For the construction of buildings, the subheads of the estimate are

Brickwork Flooring, Wood work, Steel work
All of these
Brickwork, Stone work, Roofing
Earthwork, Concrete work, Brick work

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Estimating and Costing
The assumption on which the trapezoidal formula for volumes is based, is

All listed here
The end sections are parallel planes
The mid-area of a pyramid is half the average area of the ends
The volume of the Prismoidal is over-estimated and hence a Prismoidal correction is applied

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