Estimating and Costing
While estimating the qualities for the construction of a building, the correct metric unit is

Cubic metre for area
Liter for capacity
Square meters for volume
Meter for length

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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 end sections are parallel planes
The mid-area of a pyramid is half the average area of the ends

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