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# Unit 7:Circles Vocab

### Vocabulary for Chapter 10 of Mc Dougal Littel Geometry Textbook.

TermDefinition
circle The set of all points in a place that are equidistant form a given point called the center.
center Given point that has a set of all points equidistant from it.
chord A SEGMENT whose endpoints are on a circle.
circumscribed circle The circle that contains the vertices of an inscribed polygon.
diameter A CHORD that passes through the center of a circle. The distance across a circle through its center.
arc Part of the circumference(edge) of circle.
external segment The part of a secant segment that is OUTSIDE the circle.
inscribed angle An angle whose vertex is on a circle and whose sides contain chords of the circle.
inscribed polygon A polygon whose vertices all lie on a circle.
intercepted arc The arc that lies in the interior of an inscribed angle and has endpoints on the angle.
secant segment A segment that contains a chord of a circle and has exactly one endpoint out the circle.
secant A LINE that intersects a circle in TWO points.
segments of a chord When two chords intersect in the interior of a circle, each chord is divided into two segments called segments of the chord.
semi circle An arc with endpoint that are the endpoint of a diameter of a circle. The measure of a semicircle is 180 degrees.
tangent A line in the plane of a circle that intersect the circle in exactly ONE point, the point of tangency.
radius A segment whose endpoints are the center of the circle and a point on the circle. The distance from the center of a circle to any point on the circle.
Created by: sssimone