Estimating and Costing
According to Indian Standards Institute, the actual size of modular bricks is

20 cm x 10 cm x 10 cm
25 cm x 13 cm x 7.5 cm
23 cm x 11.5 cm x 7.5 cm
19 cm x 9 cm x 9 cm

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

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