Calculates the center points and the tangential points of the circles that are tangential to the given curves and have the given radius. There may be any number of solutions, including no solution. Each solution consists of three points: 1.: the center, 2.: the tangential point to the first curve, 3.: the tangential point to the second curve. The length of the returned array is a multiple of 3 (or 0)

Calculates the center points and the tangential point of the circles that are tangential to a given curve with a given circlepoint and have the given radius. There may be any number of solutions, including no solution. Each solution consists of two points: 1.: the center, 2.: the tangential point to the curve. The length of the returned array is a multiple of 2 (or 0)

Calculates the center points and the tangential points of the circles that are tangential to the given curves. If the curves are lines or circles all possible solutions are revealed. If the curves are more complex, only the solution that is closest to the given points is revealed. Each solution consists of 4 points: 1.: the center, 2.: the tangential point to c1, 3.: the tangential point to c2, 4.: the tangential point to c3. The radius mus be calculated by the distance of the center to one of the tangential points. The length of the returned array is a multiple of 4 (or 0)