Mathematics · Coordinate Geometry
If the chord joining the points (1, 2) and (2, -1) on a circle subtends an angle of π4 at any point on its circumference, then the equation of such a circle is:
- 1x2 + y2 + 6x + 2y + 5 = 0
- 2x2 + y2 - 6x + 2y + 5 = 0
- 3x2 + y2 - 6x - 2y + 5 = 0✓
- 4x2 + y2 + 6x - 2y + 5 = 0
Correct answer
x2 + y2 - 6x - 2y + 5 = 0
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