Tangent-Radius Theorem
Move point C and observe what happens.
Tangent-Radius Theorem
A line is tangent to a circle if and only if the[br]line is perpendicular to the radius drawn to the point of tangency.
In simple terms:[br]The angle between a tangent and a radius is 90[sup]0[/sup].
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Informatie: Tangent-Radius Theorem