When do I use (x−h)²+(y−k)² = r² in Conic Sections, and what does it mean?
equation of a circle with centre (h,k), radius r.
(x−h)²+(y−k)² = r² — equation of a circle with centre (h,k), radius r. Use it when: any circle. Always check the condition holds before plugging in numbers.
Key point
(x−h)²+(y−k)² = r²
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