Animación variando la excentricidad - Cónicas: Circulo, Parabola, Elipse, Hiperbola

https://www.mathsisfun.com/geometry/eccentricity.html

Eccentricity

Eccentricity: how much a conic section (a circle, ellipse, parabola or hyperbola)
varies from being circular.

https://www.mathsisfun.com/geometry/eccentricity.html

A circle has an eccentricity of zero, so the eccentricity shows you how "un-circular" the curve is. Bigger eccentricities are less curved.

Different values of eccentricity make different curves:

• At eccentricity = 0 we get a circle
• for 0 < eccentricity < 1 we get an ellipse
• for eccentricity = 1 we get a parabola
• for eccentricity > 1 we get a hyperbola
• for infinite eccentricity we get a line

Eccentricity is often shown as the letter e (don't confuse this with Euler's number "e", they are totally different)