Math
part of a circle
arc
tangents that intersect the segment joining the centers of the two circles
Common Internal Tangents
tangents which do not intersect the segment joining the centers of the two circles
Common External Tangents
an angle whose vertex is the center of the circle
Central Angle
the length of an arc
Arc Length
the measure of a major arc that is equal to 360 minus the measure of the minor arc with the same endpoints
Degree Measure of a major arc
circles with congruent radii
Congruent Circles
a line that is tangent to two circles on the same plane
Common Tangent
two arcs that have the same measure
Congruent Arcs
The arc that lies in the interior of an inscribed angle and has endpoints on the angle.
Intercepted Arc
a secant segment that is outside of a circle
External Secant Segment
the measure of the central angle which intercepts the arc
Degree Measure of a Minor Arc
an angle whose vertex is on the circle
Inscribed angle
a region bounded by an arc of the circle and the two radii to the arc's endpoints
Sector of a circle
A line that intersects a circle in two points
Secant
an arc that is less than a semicircle
Minor Arc
the point of intersection of the tangent line and a circle
Point of Tangency
an arc that is larger than a semicircle
Major Arc
equation to find the distance
Distance Formula
a proof using figures on a coordinate plane
Coordinate Proof
a line coplanar with the circle
Tangent to a circle
half of a circle
Semicircle
the region bounded by an arc and the segment joining its endpoints
Segment of a circle
A point that divides a segment into two congruent segments
Midpoint
the absolute value of the difference of the x coordinates of two points
Horizontal Distance