What is the name of the line intersecting a circle at only one point?
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A line that intersects a circle in exactly one point is called a tangent and the point where the intersection occurs is called the point of tangency. The tangent is always perpendicular to the radius drawn to the point of tangency.
tangent radius secant
A secant is a line that intersects a circle in exactly two points.
When a tangent and a secant, two secants, or two tangents intersect outside a circle then the measure of the angle formed is one-half the positive difference of the measures of the intercepted arcs.
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Tangent
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