# Math - Chapter 10 Vocab

A math chapter about circles.

## 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
- radius of 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