Estimating and Costing
In long and short wall method of estimation, the length of long wall is the centre to centre distance between the walls and

Half breadth of wall on each side
None of these
One fourth breadth of wall on each side
Breadth of the wall

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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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