Estimating and Costing
The main factor to be considered while preparing a detailed estimate, is

Transportation of materials
All of these
Availability of materials
Quantity of the materials

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

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
All listed here

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