# math unit 10 vocab

## 23 terms

### circle

set of all points in a plane that are a given distance from given point in plane

### center

given point on plane that is the middle of the circle

### chord

segment of circle joining any 2 points

### concentric

2 or more coplanar circles withe the same center

### diameter

chord that passes through center

given distance from circle to center

### arc

2 points on a circle and all the points need to connect them

### tangent

line that intersects a circle at exactly one point

### secant

line that intersects circle at exactly 2 points

### point of tangency

one point the tangent intersects on a circle

### line of centers

segment that connects centers of circles

### central angle

angle whose vertex is at center of circle

### major arc

arc whose points are on or outside central angle

### minor arc

arc whose points are on or between sides of central angle

### semicircle

arc whose endpoints are endpoints of diameter

### inscribed angle

angle whose vertex is on a circle and whose sides are determined by 2 chords

### tangent segment

part of tangent line between point of contact and point outside circle

### secant segment

part of secant line that joins a point outside the circle to the point at the secant of the circle

### circumcenter

center of a circle circumscribed about a polygon

### circumscribed polygon

all of its side are tangent to the circle

### incenter

center of circle inscribed in a polygon

### inscribed polygon

all vertices lie on circle

### circumference

perimeter of circle