Geometry in Ancient and Medieval India c8.19

c8.19

The first of these, which can be derived from the right triangle formed by the half chord, the radius at its end and part of the radius perpendicular to the chord (i.e. from the in figure 1), or from the ', requires thorough familiarity with the properties of the right triangle and of circles and chords, for its formulation. The next three are rough approximations from the formulae for the circumference of a circle.