Ellipse with semi-major axis a and semi-minor axis b. Sum of distances from any point to both foci is constant (2a).
Planetary orbits — All planets orbit the Sun in ellipses (Kepler's first law).
Whispering galleries — Elliptical rooms focus sound between foci.
Medical imaging — Elliptical CT scanner gantries.
Gear design — Elliptical gears for variable speed ratios.
Architecture — Elliptical arches and domes.
Sports tracks — Running track shape (two semicircles + straight sections).
Pool tables — Elliptical table sends ball through both foci.
Astronomy — Cometary orbits are highly elliptical.
Optics — Ellipsoidal mirrors in telescopes.
Mapmaking — Ellipsoidal Earth model for GPS.
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