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radius
half of the diameter

center
the center of the circle

chord
a segment whose endpoints are on a circle

diameter
a chord that passes through the center of a circle

secant
a line that intersects a circle at two points

point of tangency
a line that intersects the circle exactly one point

tangent segments from a common external point are
congruent

central angle
an angle whose vertex is the center of the circle

semicircle
arc with endpoints of a diameter

arc
unbroken part of the circle

minor arc
part of a circle measuring <180^{ }degrees

major acr
part of a circle measuring between 180 and 360 degrees

measure of a minor arc
named with two letters

measure of a major arc
named with three letters

congruent circles
two circles are congruent if they have the same radius

congruent arcs
two arcs are congruent arcs if thhey have the same measure and are acrcs of the same circle or of congruent circles

inscribed angle
an angle whose vertex is on a circle

intercepted arc
the arc that lies in the interior of an inscribed angle and has endpoints on the angle

inscribed polygon
a polygon whose vertices all lie on a circle

circumscribed circle
a circle that contains the vertices of an inscribed polygon

segment of a chord
when two chords intersect the interior of a circle , each chord is divided into two segments

secant segment
a segment that contains a chord of a circle and has exactly one endpoint outside the circle

external segment
the part of secant segment that's outside the circle

circumference
the distance around a circle

arc length
portion of the circumference of a circle

sector of a circle
the region bounded by two radiis of the circle and their intercepted arc

sphere
the set of all points in space equidistant from a given point

center of a sphere
the given point from which all points on the sphere are equidistant

radius of a sphere
a segment from the center to a point on the sphere

chord of a sphere
a sphere is a chord that contains the center of the sphere

great circle
the intersection of the sphere and a plane that contains the center of the sphere

hemisphere
one of the congruent halfs of a sphere


