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.
We have defined the ellipse as the “locus of centers circumferences, through a focus, They are tangent to the focal circumference of the other focus center”.
This definition allows us to approach the study of the conic by applying the concepts studied to solve the problems of tangents and, en particular, reducing them to the fundamental problem of tangents.
This circumference will link with another whose radius is half the radius of the focal, and its center is the taper. We call this circumference “Head circumference”.
