A line or segment that is tangent to two circles in the same place.

For a line that intersects a circle in only one point, the point at which they intersect.

A line in the plane of a circle that intersects the circle in exactly one point. The point of intersection is called the point of tangency.

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Geo_5.3

Vocabulary for Geometry_5.3

Term	Definition
common tangent	A line or segment that is tangent to two circles in the same place.
point of tangency	For a line that intersects a circle in only one point, the point at which they intersect.
tangent	A line in the plane of a circle that intersects the circle in exactly one point. The point of intersection is called the point of tangency.