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what is a tangent to a circle?
line in the plane of the circle that intersects the circle in exactly one point
if a line is tangent to a circle, then the line is _____ to what?
perpendicular to the radius dawn to the point of tangency
if a line in the plane of a circle is perpendicular to a raidius at its endpoint on the circle, then the line is ______ to the circle
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