Geometry Vocab Quiz 3/2/2010
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Created by:
mggardnergrieco on March 1, 2010
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19 terms
Terms | Definitions |
|---|---|
 central angle | an angle whose vertex is the center of a circle and whose sides contain radii |
| arc | formed by 2 points on the circle and the continuous part of the circle between the 2 points (called endpoints) |
| minor arc | if m<APB is less than 180, then A and B and the points of circle P in the interior of <APB form a minor arc. measure of minor arc = measure of central angle |
| major arc | the points A and B and the points of circle P that do not lie on minor arc AB form a major arc. measure of major arc = 360 - measure of its minor arc |
| circle | set of points in a plane at a given distance from a given point in that plane |
| semicircle | an arc whose endpoints are the endpoints of a diameter, 180 degrees |
| congruent circles | two circles are congruent if they have the same radius |
| congruent arcs | two arcs of the same circle or congruent circles are congruent if they have the same measure ***TWO minor arcs of the same circle or of congruent circles are congruent if their central angles are congruent |
| center | the given point in a circle |
| radius | given distance in a circle, any segment that joins the center to a point of the circle is called a radius |
| chord | a segment whose endpoints lie on a circle |
| secant | line that contains a chord |
| diameter | chord that contains the center of a circle |
| tangent | line in the plane of a circle that intersects (90 degree angle) the circle in exactly one point |
| point of tangency | where tangent intersects the circle in exactly one point |
| sphere | the set of all points in space at a distance r from point O |
| concentric circles | circles that lie in the same plane and have the same center |
| concentric spheres | spheres that have the same center |
| inscribed / circumscribed | when each vertex of the polygon lies on the circle |
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