Circle EquationsHigh School · Geometry · HSG-GPE.A.1, HSG-C.A.1
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High School · Geometry · Think & learn · Ages 14–18

Circle Equations

Maths standardHSG-GPE.A.1HSG-C.A.1Derive and use the equation of a circle from its center and radius, completing the square when needed.

  1. Center (h, k): watch the signs — (x − 2) means h = 2.
  2. The right side is r², not r.
  3. Complete the square to find the center and radius.
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