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a set of points equidistance from the center

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## terms list

circle

a set of points equidistance from the center

radius

segment going from the center to any point of the circle

chord

segment containing 2 points on the circle

diameter

a chord passing through the center of the circle

circumference

distance around the circle

arc of a circle

is the set of points between and including two point on the circle

semicircle

Half of a circle, degree of measure of a emicircle is 180 degress

central angle of a circle

is an angle that has its vertix at the center of the circle, determines two arcs on a circle

minor arc of a circle

smaller of two arcs - measured in degrees

major arc of a circle

larger of two arcs - measured in degrees

inscribed angle of a circle

vertix is on a cirlec and whose sides are chords of the circle

intercepted arc of a circle

interior arc of an inscribed angle and whose endpoints are on the sides of the angle

secant to a circle

line going through a circle, is a line that contains a chord

tangent to a circle

line touching outside of circle, is a line in the plane of the circle that intersects the circle in only one point.

concentric circles

are circles that have the ame center

sector of circle

is region bounded by two radii and an arc of the circle

polygon inscribed in a circle

if each of its vertices lies on the circle, polygon inside circle

polygon is circumscribed about a circle

if each of its sides is tangent to the circle, circle inside polgyon

point of tangency

the point of contact

inscribed angle measure

is half the measure of intercepted arc

intercepted arc measure

is twice the measure of the inscribed angle measure

two intersected chords angles measure

each of the interior angles formed equals one-half the sum of its interrcepted arcs

two intersected cords segment length

one chord equals the product of the lengths of the segments

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