Estimating and Costing
While preparing a detailed estimate

Area should be measured correct to 0.01 sqm
Volume should be measured correct to 0.01 cum
All of these
Dimension should be measured correct to 0.01 m

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

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

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