Modern Diagram for the Indian trig functions, Jya and Kojya.

Jya = R Sin

Kojya = R Cos

... R being Vyasardha, the Radius of the Circle = 206265 seconds.

...
These are the trig functions used in Graha Ganitha and is highlighted in Bhaskara's Ganitha Adhyaya.

As one Zodiacal Sign defines 30 degrees of Arc, three consecutive Signs constitue one Vritta Pada, Quadrant of a Circle = 90 degrees and Indian mathematicians used the term Trijya for Radius of the Circle.