Given a straight **s: Ax + Bx + C = 0** and a circumference of equation **(x - a) ^{2} + (y - b)^{2} = r^{2}**, let's examine the relative positions between

**s**and :

We can also determine the position of a line relative to a circle by calculating the distance from the line to the center of the circle. So given the line **s**: Ax + By + C = 0 and the circumference : (x - a)^{2} + (y - b)^{2} = r^{2}we have:

Like this:

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