Cutting a sheet of plywood
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They are used to mount telescopes and binoculars.
Constructions, drawings, sketches, etc.
All of the radii of a circle are congruent CPCTC sss triangle congruence postulate
It is used to prove some of the statements used in Einstein's The general Theory of relativity
Parabolas are used in real life in light reflectors on cars to create a concentrated beam of intense light. Braking distance and stopping distance are quadratic formulas so their graphs are parabolas. A ball in motion in space has a path of a parabola.