Mathematics in Ancient and Medieval India c6.s2.13

c6.s2.13

The *tiryaṅmānī* was obtained by pulling out the middle point of a rope to the right or left of the *prācī* or *pārśvamānī* with its ends tied to two points on the *prācī* or *pārśvamānī*. This gives rise to an isosceles triangle where the equal sides are represented by the two halves of the ropes. The line joining the apex of this triangle i. e. the middle point of the rope, with the middle point of two fixed points on the *prācī* gives the line *tiryaṅmānī* which is obviously the perpendicular line.