Create Conic Section of Ellipse
We consider the points A (-15.15), B (0.15) .
We create the line segment AB with fixed length a = 15.
We consider point C on it.
In the algebra's window of software we could calcuale distances AC = d1 and BC = d2.
We consider variable c and points C (-c, 0) and E (c, 0).
Manufactured circle C1 with center E' and radius d2, and circle C2 with center E and radius d1.
We call M and N the intersection points.
Notice the geometric construction of the shape displayed