Further MathematicsCoordinate geometry and conic sectionsWAEC
Find the centre and radius of the circle x² + y² − 4x + 6y − 3 = 0.
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Answer: C. centre (2, −3), radius 4
(x − 2)² + (y + 3)² = 3 + 4 + 9 = 16, so r = 4.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.