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Equation of a Circle in some special cases

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Estimated time: 2 minutes
Maharashtra State Board: Class 12

Key Points: Equation of a Circle in some special cases

Case Condition Equation
Touches X-axis Radius = y-coordinate (k) (x − h)² + (y − k)² = k²
Touches Y-axis Radius = x-coordinate (h) (x − h)² + (y − k)² = h²
Touches both axes Centre (±a, ±a), radius = a (x ± a)² + (y ± a)² = a²
Passes through the origin (x − h)² + (y − k)² = h² + k²
General form (origin case) x² + y² − 2hx − 2ky = 0
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