Generally, the equation of a circle is (x-a)2 + (y-b)2 = r2
where (a,b) is the centre of a circle, and r is the radius.
So you can use this equation along with a general line equation, y=mx+c, or using the gradient and finding the equation of the normal.
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A tangent of a circle is a straight line that touches the circle at only one point.
The tangent line. A secant line hits the circle in two places and forms a cord, but the tangent line only hits the circle in one point and is always perpendicular to the radius of the circle which exists at that point.
A tangent line.
A tangent line.
Tangent