History of Hindu Mathematics: A Source Book v2.c17.s19.t1.29

v2.c17.s19.t1.29

“The sides and uprights of two optional right triangles being multiplied by their reciprocal hypotenuses become the sides : in this way has been derived a quadrilateral of unequal sides. There the two diagonals can be obtained from those two triangles. The product of the uprights, added with the product of the sides, gives one diagonal; the sum of the reciprocal products of the uprights and sides is the other.”∗2