The Shulbasutras of Baudhayana, Apastamba, Katyayana and Manava: With Text, English Translation and Commentary c8.t38.5

c8.t38.5

For square *gārhapatya* of one square *puruṣa*, he advises the whole area to be divided into 18 rectangular parts each of length ⅓ of a *puruṣa* and breadth ⅙ of a *puruṣa* (*Mśl*. 13.8.-13.9). Clearly, each brick measures 40 *aṅg* × 20 *aṅg*. Three corner bricks are replaced by those of size, 20 *aṅg* × 20 *aṅg*. thereby making the number of bricks 21. In the next layer the length and breadth are interchanged.