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How to find the distance between a circle's center and a tangent line?

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hello :
let an equation of the tangent line : ax+by = c
the center of the circle is : A(X0 ,Y0)
the distance between a circle's center and a tangent line is : d
d= |aX0 +bY0 - C| /(√(a²+b²)
User Kyle Uithoven
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