Chord of Circle
  Coordinate x1(a)
cos of angle chord makes at center
Sum of x coordinates c
Sum of y coordinates d
x coordinate of center (e)
y coordinate of center (h)
x coordinate general
y coordinate general
Find Radius Square
Find Radius
Find Slope
Find x intercept
Find y intercept
Find length square of chord
Find length  of chord
Find Coordinate y1(t)
The Point (x, y) is

       Chord with (x1,y1) & (x2,y2) on circle, Center at(-g,-f) & radius r