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11 terms

chapter 10: circles

STUDY
PLAY
circle
the set of all points in a plane that are equidistant form a given point
radius
a segment whose endpoints are the center of the circle and a point on the circle
diameter
a segment whose endpoints are both on the circle and passes through the center
chord
a segment whose endpoints are both on the circle
secant
a line that intersects the circle in two points
tangent
a line that intersects the circle in one point that is coplanar
concentric circles
have the same center and are coplanar
common tangent
tangent lines to more than one circle in one plane
thm 10-1
a tangent line is perpendicular to the radius at the point of tangency
thm 10-2
in a plane, if a line is perpendicular to a radius at its endpoint on the circle then the line is tangent to the circle
thm 10-3
tangent segments are congruent