Pick up the correct statement regarding the centre line method of estimating a building?

Question

Xaibi Aslam · Accepted Answer

All the above

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Product of the centre line of the walls and area of cross-section of any item, gives total quantity of the item

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The centre line is worked out separately for different sections of walls of a building

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The centre line length is reduced by half the layer of main wall joining the partition wall

Question #77797