Standard parabola with vertex at origin, focus at (a,0). All points are equidistant from focus and directrix.
Satellite dishes — Parabolic shape focuses signals at the receiver.
Headlight reflectors — Parabolic mirrors create parallel beams from point source.
Solar concentrators — Parabolic troughs focus sunlight for heating.
Projectile motion — Path of thrown objects is parabolic.
Suspension bridges — Cable shape under uniform load.
Radio telescopes — Large parabolic dishes collect weak signals.
Acoustic mirrors — Sound focusing in whisper galleries.
Water fountains — Parabolic water jets.
Ski jumps — Trajectory of jumpers.
Architecture — Parabolic arches for strength.
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