Function incirclefast

incirclefast(
    ax: number,
    ay: number,
    bx: number,
    by: number,
    cx: number,
    cy: number,
    dx: number,
    dy: number,
): number
Parameters
- ax: number
  x coordinate of first point
- ay: number
  y coordinate of first point
- bx: number
  x coordinate of second point
- by: number
  y coordinate of second point
- cx: number
  x coordinate of third point
- cy: number
  y coordinate of third point
- dx: number
  x coordinate of comparison point
- dy: number
  y coordinate of comparison point
Returns number
- point d is in circle if the return value is less than 0, otherwise not in circle