Circle with center (h,k) and radius r. All points at distance r from center satisfy this equation.
GPS — Circle of possible locations from one satellite signal.
Radar — Circular detection range around a station.
WiFi coverage — Circular signal range from router.
Irrigation — Circular sprinkler coverage area.
Gaming — Circular area-of-effect in games.
Urban planning — Service area radius from facilities.
Astronomy — Planetary orbits (approximation).
Manufacturing — Circular machine tool paths.
Architecture — Circular windows and arches.
Sports — Circular field boundaries.
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