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- Both and are points of the x-axis and and are points on the y-axis (en)
- An ellipse, the "reflecting," "whispering gallery" property of the foci and illustrated: The distance from to may be great, but a whisperer at can be heard, as . (en)
- A blue circle, graphed with a red ellipse. An elliptical dome has an elliptical base, and an ellipsoidal dome has a circular base. (en)
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