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Geo_1.1

Vocabulary for Geometry_1.1

TermDefinition
acute angle An angle with a degree measure less than 90.
adjacent angles Two angles that lie in the same plane, have a common vertex and a common side, but no common interior points.
angle The intersection of two noncollinear rays at a common endpoint. The rays are called sides and the common endpoint is called the vertex.
collinear Points that lie on the same line.
complementary angles Two angles with measures that have a sum of 90.
construction A method of creating geometric figures without the benefit of measuring tools. Generally, only a pencil, straightedge, and compass are used.
coplanar Points that lie in the same plane.
congruent segments Line segments that have the same measure.
defined term Term explained using undefined terms and/or other defined terms.
definition Term explained using undefined terms and/or other defined terms.
degree A unit of measure used in measuring angles and arcs. An arc of a circle with measure of 1° is 1/360 of the entire circle.
distance The length of the segment between two points.
intersection A set of points common to two or more geometric figures.
line segment A measurable part of a line that consists of two points, called endpoints, all all the points between them.
line A basic undefined term of geometry. A line is made up of points and has no thickness or width. In a figure, a line is shown with an arrowhead at each end. Lines are usually named by lowercase script letters or by writing capital letters for two points on the line, with a double arrow over the pair of letters.
linear pair A pair of adjacent angles whose non-common sides are opposite rays.
midpoint The point on a segment exactly halfway between the endpoints of the segment.
obtuse angle An angle with degree measure greater than 90 and less than 180.
perpendicular Lines, segments, or rays that form right angles.
plane A basic undefined term of geometry. A plane is a flat surface made up of points that has no depth and extends indefinitely in all directions. In a figure, a plane is often represented by a shaded, slanted four-sided figure. Planes are usually named by a capital script letter or by three noncollinear points on the plane.
point A basic undefined term in geometry. A point is a location. In a figure, points are represented by a dot. Points are named by capital letters.
ray A part of a line with one endpoint and extends indefinitely in one direction.
right angle An angle with degree measure of 90.
segment bisector A segment, line, or plane that intersects a segment at its midpoint.
space A boundless, three-dimensional set of all points.
supplementary angles Two angles with measures that have a sum of 180.
undefined term Terms only explained by examples and descriptions.
vertex A common endpoint.
vertical angles Two nonadjacent angles formed by two intersecting lines.
Created by: mtoepper