Geometry Ch 10 Vocabulary

18 terms

arc

a part of a circle that is defined by two endpoints

center

a point where all the points on the circle are equidistant to

central angle

an angle that intersects a circle in two points and has its vertex at the center of the circle

chord

A segment with endpoints that are on the circle

circle

the locus of all points in a plane equidistant from a given point called the center

circumference

the distance around a circle

circumscribed

a circle is _________ about a polygon if the circle contains all the vertices of the polygon

diameter

a chord that passes through the center of the circle

inscribed

a polygon is ________ in a circle if each of its vertices lie on the circle

intercepted

an angle ___________ an arc if and only if : the endpoints of the arc lie on the angle, all points of the arc except the endpoints are in the interior of the circle, and each side of the angle contains an endpoint of the arc.

major arc

an arc with a measure greater than 180

minor arc

an arc with a measure less than 180

pi

an irrational number represented by the ratio of the circumference of a circle to the diameter of the circle.

point of tangency

for a line that intersects a circle in only one point, the point at which they intersect

any segment with endpoints that are on the center of the circle and a point on the circle

secant

any line that intersects a circle in exactly two points

semicircle

an arc that measures 180

tangent

a line in the plane of a circle that intersects the circle in exactly one point