10.1 Flashcards
Circle
set of all points in a plane that are equidistant from a given point called the center (of the circle). If the center is P, then the circle can be denoted by (circle w/ middle dot) P
Interior of a Circle
points inside of a circle
Exterior of a Circle
points outside of a circle
Chord
a segment whose endpoints are on the circle
Diameter
a chord that passes through the center of the circle
Radius
a segment whose endpoints consist of the center of the circle and a point on the circle
Tangent
if a line intersects a circle at exactly one point, then the line is a tangent of the circle
Point of Tangency
the point of intersection (of a tangent) is called the point of tangency
Secant
if a line intersects a circle at two points, then the line is a secant of the circle
Common Tangent
a line that is tangent to two circles
Common External Tangent
a common tangent that does not intersect the segment that joins the centers of the circles
Common Internal Tangent
a common tangent that intersects the segment that joins the centers of the circles
Tangent Circles
are (two) circles that have exactly one point of intersection
Ex. Internally and Externally (circles are tangent to each other)
Concentric Circles
are (two) circles that have the same center (but different radii)
Ex. Ripples
Congruent Circles
two circles are congruent if they have congruent radii or congruent diameters
