Geometryeasy · Past Paper
Which of the following is the general equation of a circle?
Ax^2 + y^2 + 2gx + 2fy + c = 0
By = mx + c
Cx^2 - y^2 = r^2
Dax + by + c = 0
✓ Correct Answer: A — x^2 + y^2 + 2gx + 2fy + c = 0
This represents a circle where center is (-g, -f) and radius is sqrt(g^2+f^2-c).
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