###
what is a tangent to a circle?

line in the plane of the circle that intersects the circle in exactly one point

###
what is the point of tangency?

the point where a circle and a tangent intersect

###
if a line is tangent to a circle, then the line is _____ to what?

perpendicular to the radius dawn to the point of tangency

###
p.663, example 1. what is the falue of x?

63

###
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

tangent

###
the two segments ____ to a circle from a point outside the circle are _______

tangent; congruent

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