part of a circle that is defined by two endpoints
arc
central point where radii form a locus of points
center
angle that intersects a circle in two points & has its vertex at the center
central angle
segment with endponts that are on teh circle
chord
segments that form when two chords intersect inside a circle
chord segments
the locus of all points in a plane equidistant from a given point
circle
the distance around a circle
circumference
arcs in the same circle or in congruent circles that have the same measures
congruents arcs
a chord that passes through the center of the circle
diameter
a polygon is inscribed in a circle if each of its vertices lie on the circle
inscribed
angle that has a vertex on a circle & sides that contain chords of the circle
inscribed angle
an arc with a measure greater than 180
major arc
an arc with a measure less than 180
minor arc
irrational number represented by the ratio of the circumference of a circle to the diameter of the circle
Pi
a line that intersects a circle in only one point, he point at which they intersect
point of tangency
a circle, any segment with endpoints that are the center of the circle & a point on the circle
any line that intersects a circle in two points
secant
segment of a secant line that has one endpoints on the circle
secant segment
arc that measures 180
semicircle
an acute angle of a right triangle the ratio of the measure of the leg opposite the acute angle to the measure of leg adjacent to the acute angle
tangent

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