Mathematics in Ancient and Medieval India c6.s2.33

c6.s2.33

2 ) *Dvirajjuvidhi*²—In the construction of altars of various geometrical shapes by these methods, instead of a combined cord consisting of two parts ( *ekarajjuvidhi* ), two separate cords of different lengths ( *dvirajjuvidhi* ) were employed. Two ends of each of these cords were tied to the two poles on a *prācī* whose distance was less than that of the cord. A mark was made on each of these cords at a spot representing the *nirañchana* mark and putting the cord at the mark on each side of the *prācī*, two right angled-triangles could be obtained as in the case of combined cord By joining the vertices of four such triangles, drawn with the help of these two cords, an isosceles trapezium could be constructed. Isosceless trapezium of different sizes were drawn by using the cords of multiple lengths with their corresponding *nirañchana* mark.