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Figure 1 |
Equation 1 |
The sum of two lines; one from one foci (F1) to a given point on the ellipse curve (x, y), and from the other foci (F2) to the same point (x, y), always equals a constant.
Based on this definition, the following is true: d1 + d2 = constant (2a) as shown in Figure 1 below,
NOTE: To see how the equation of the ellipse can be derived
based on this definition - See Appendix A.
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Figure 1 |
Equation 1 |