The tangent to a circle is a line circle that intersects the circle in exactly one point. The point where the tangent touches the circle is the point of tangency.
Line n is tangent to circle O with point of tangency at P.
Property 1:
A tangent to a circle is perpendicular to the radius drawn to the point of tangency.
OP is perpendicular to tangent line n.
Property 2:
Tangent segments to a circle from a point outside the circle are congruent.
AB = AC
Property 3:
The angle formed by a tangent and a chord is congruent to the inscribed angle on the opposite side of the chord.
angle APB = angle PCB
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