The one with a distance in the amid of the foci of 20 cm, as it is 0.8 cm to 0.6 cm.
The ellipse is one of the four classic conic segments produced by slicing a cone with a plane. The others are the circle, the parabola, and the hyperbola. The ellipse plays a vital role in astronomy as celestial objects in the periodic orbits around the other celestial objects all trace out ellipses.
For example, The Earth's orbit around the Sun is in the shape of an ellipse.
