Curve has to fit through fixed point

Useful when setting curve points (1/4 points and mid point) from PI

Given: D , a, the angle to desired point on curve

Find: R and T

Law of sin

Sin e / sin d = (R + E) / R

Cos(a+q) = c0s(a + D/2) / cos D/2

Solve for q

Then R = y / vers q