Mathematics · Coordinate Geometry
A circle S = x2 + y2 + 2gx + 2fy + 6 = 0 cuts another circle x2 + y2 - 6x - 6y - 6 = 0 orthogonally. If the angle between the circle S = 0 and the circle x2 + y2 + 6x + 6y + 2 = 0 is 60°, then the radius of the circle S = 0 is:
- 15
- 24
- 31
- 42✓
Correct answer
2
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