Geometry Ch 10 Vocabulary
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18 terms
Terms | Definitions |
|---|---|
 arc | a part of a circle that is defined by two endpoints |
| center | a point where all the points on the circle are equidistant to |
| central angle | an angle that intersects a circle in two points and has its vertex at the center of the circle |
| chord | A segment with endpoints that are on the circle |
| circle | the locus of all points in a plane equidistant from a given point called the center |
| circumference | the distance around a circle |
| circumscribed | a circle is _________ about a polygon if the circle contains all the vertices of the polygon |
| diameter | a chord that passes through the center of the circle |
| inscribed | a polygon is ________ in a circle if each of its vertices lie on the circle |
| intercepted | an angle ___________ an arc if and only if : the endpoints of the arc lie on the angle, all points of the arc except the endpoints are in the interior of the circle, and each side of the angle contains an endpoint of the arc. |
| major arc | an arc with a measure greater than 180 |
| minor arc | an arc with a measure less than 180 |
| pi | an irrational number represented by the ratio of the circumference of a circle to the diameter of the circle. |
| point of tangency | for a line that intersects a circle in only one point, the point at which they intersect |
| radius | any segment with endpoints that are on the center of the circle and a point on the circle |
| secant | any line that intersects a circle in exactly two points |
| semicircle | an arc that measures 180 |
| tangent | a line in the plane of a circle that intersects the circle in exactly one point |
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