1.
a set of points in a plane that are equidistant from a given point, called the Center of the circle.
2.
given point in the center of the circle.
3.
two circles are congruent if they have the same radius.
4.
The distance across the circle, through its center.
5.
a segment whose endpoints are the center of the circle and a point in this circle.
6.
a segment whose endpoints are points on the Circle.
7.
a line that intersects a circle in two points.
8.
a line in the plane of a circle that intersects the circle in exactly one place
9.
of Tangency The single point where a tangent line intersects a geometric figure such as a circle or curve
10.
arc part of the circumference that is greater than half
11.
arc part of the circumference that is less than half of the circle
12.
tangent a line segment that is tangent to two complainer circles
13.
internal tangent intersects the segment that joins the centers of the two circles
14.
external tangent does not intersect the segment that joins the centers of the two circles
15.
of a circle consist of the points that are inside of the circle.
16.
of the circle consists of the points that are outside of the circle.
17.
Angle angle, who is the center of the circle
18.
the endpoints of an arc are the endpoints of the diameter.
