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Key Vocabulary for 2-Dimensional Geometry Vocabulary Term Acute angle Common Core Definition An angle with a measure less than 90°. Angle Angle Measure Area Two rays that share an endpoint The measure of the size of an angle. It tells how far one side is turned from the other side. The measure, in square units, of the inside of a plane figure. Classify Congruent Degree Endpoint To sort into categories or to arrange into groups by attributes. Having exactly the same size and shape A unit for measuring angles A point at either end of a line segment, or a point at one end of a ray. Intersecting Lines Line Lines that cross at a point. A set of connected points continuing without end in both directions. Line of symmetry A line that divides a figure into two congruent halves that are mirror images of each other. Line segment A part of a line with two endpoints. Obtuse Angle An angle with a measure greater than 90º but less than 180º. Parallel Lines Lines that are always the same distance apart. They do not intersect. Perimeter The distance around the outside of a figure. Perpendicular Lines Plane Figure Two intersecting lines that form right angles. Protractor A tool used to measure and draw angles. Ray A part of a line that has one endpoint and goes on forever in one direction. Right Angle An angle that measures exactly 90º. Right Triangle A triangle that has one 90º angle. Vertex The point at which two line segments, lines, or rays meet to form an angle. A two-dimensional figure.