File:Ellipse PLS en.png

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(Ellipse showing the pythagoras relation - modified by maaf)

Ellipse showing the Pythagoras relation a²=b²+c²

This shows an ellipse constructed from the two foci F1 and F2, with the Pythagorean formula shown as the square of the semi-major axis (a) equal to the sum of the square of the semi-minor axis (b) and the square of (c). (c) is the distance between the center to any of the foci. (c) is also the eccentricity times the semi-major axis.

Image adapted from: German wikipedia^{[dead link]}

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