Estimating and Costing
Pick up the correct statement regarding the centre line method of estimating a building

The centre line length is reduced by half the layer of main wall joining the partition wall
Product of the centre line of the walls and area of cross-section of any item, gives total quantity of the item
The centre line is worked out separately for different sections of walls of a building
All of these

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

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

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