acute angle - An angle with a measure less than 90°., acute triangle - A triangle with no angle measuring 90º or more, angle - Two rays or line segments that share an endpoint., angle measure - The measure of the size of an angle. It tells how far one side is turned from the other side. A one degree angle turns through 1/360 of a full circle., congruent - Having exactly the same size and shape., endpoint - A point at either end of a line segment, or a point at one end of a ray., classify - To sort into categories or to arrange into groups by attributes., degree (angle measure) - A unit for measuring angles. It is based on dividing one complete circle into 360 equal parts., intersecting lines - Lines that cross at a point., line - 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., perpendicular lines - Two intersecting lines that form right angles., point - The exact location in space represented by a dot., polygon - A closed plane figure made by line segments., 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., straight angle - An angle that measures exactly 180º, vertex - The point at which two line segments, lines, or rays meet to form an angle. (plural - vertices),

Unit 8 Vocabulary

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