# Math - Chapter 10 Vocab

## Terms

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secant
a line that intersects a circle in two points
tangent segment
a segment that is tangent to a circle at an endpoint
tangent
a line in the plane of a circle in exactly one point
chord
a segment whose endpoints are point on the circle
central angle
an angle whose vertex is the center of a circle
standard equation of a circle
a circle with radius (r) and center (h,k) had this standard equation: (x-h)2 + (y-k)2 = r2
circle
polygon with no straight sides
tangent circles
coplanar circles that intersect in one point
congruent circles
two circles with the same radius
congruent arcs
two arcs of the same circle or of congruent circles
semicircle
the endpoints of an arc are the endpoints of a diameter
circumscribed circle
a circle with an inscribed polygon
point of tangency
the point at which a tangent line intersects the circle to which it is tangent
inscribed polygon
when all the vertices lie on a circle
the distance from the center to a point on the circle
minor arc
part of a circle that measures less than 180
common tangent
a line or segment that is tangent to two coplanar circles
locus
the set of all points that satisfy a given condition or a set of gieven conditions
inscribed angle
an angle whose vertex is on a circle and whose sides contain chords of the circle
concentric circles
coplanar circles that have a common center
measure of a major arc
the difference between 360 and the measure of its associated minor arc
major arc
part of a circle that measures from 180 to 360
diameter of a circle
the distance across the circle
center of a circle
the set of all points in a plane that are quidistant from a given point
exterior of a circle
points that are outside the circle
external segment
the part of a secant segment that is not inside the circle
interior of a circle
points that are inside the circle
secant segment
a segment that intersects a circle in two point, with one point as an endpoint of the segment
intercepted arc
the arc that lies in the interior of an inscribed angle and had endpoints on the angle
measure of a minor arc
the measure of its central angle

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