Circle: standard and general equations
Two-dimensional geometry · Mathematics
Study notes
Q: Identify: x² + y² + 6x − 4y − 12 = 0. Centre? Radius? 2g = 6 → g = 3; 2f = −4 → f = −2. c = −12. Centre = (−3, 2). Radius = √(9+4+12) = √25 = 5.
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Two-dimensional geometry · Mathematics
Q: Identify: x² + y² + 6x − 4y − 12 = 0. Centre? Radius? 2g = 6 → g = 3; 2f = −4 → f = −2. c = −12. Centre = (−3, 2). Radius = √(9+4+12) = √25 = 5.