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OpenStudy (anonymous):
A line that intersects the radius of a circle at a point on the circle and is perpendicular to the radius is known as a tangent. True or false?
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Directrix (directrix):
True.
Directrix (directrix):
If a line is perpendicular to a radius at its outer endpoint, then it is tangent to the circle. http://staff.fcps.net/scombs/PostulatesTheorems.htm
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