We have solved the determination of a conic defined by the two foci and focal point by the circumference of the conical.
A problem using identical concepts is determining a known conic its foci and their tangents. We will see this problem in the case of an ellipse.
One of the first problems we can solve based on the definition of conic as “locus of the centers of circumferences passing through a fixed point (focus) which are tangent to a circumference (focal circle centered the other focus)” It is the determination of the tapered from the two foci and a point.
The classic definition will be determined as the vertices A1 and A2 of the conical obtained.
