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# Vocabulary Game #2, Geometry

## by Joshua Cook, Faculty at UCLA, Graduate School of Education and Information Studies, Teacher Education Program on Apr 23, 2009

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## Vocabulary Game #2, GeometryPresentation Transcript

• VOCABULARY GAME #2
• GEOMETRY: BASIC CONCEPTS
• Supplementary Angle
• An angle that will add with another angle to form a straight angle
• Definition
• A statement that explains the meaning of a word or phrase
• Theorem
• A statement that has been proven within a deductive system
• Acute Angle
• An angle less than 90°
• Scalene Triangle
• A triangle with no congruent sides
• Center
• The point from which all points on a circle are the same distance
• Angle
• Two non-collinear rays having a common endpoint
• Corresponding Angles
• Two angles formed by a transversal intersecting two lines that lie in the same relative position
• Transversal
• A line that intersects two or more other lines
• Linear Pair
• Two angles that sum to form a straight angle.
• Obtuse Angle
• An angle that is greater than 90°
• Two-Column Proof
• A form of proof in which each statement in the argument is written in the left column and the reason for each statement is written directly across from it in the right column
• Point
• An undefined term thought of as a location with no size or dimension. It is the most basic building block of geometry.
• Complementary Angles
• An angle that you add to another angle to make 90°
• Vertex
• A point of intersection of two or more rays or line segments in a geometric figure.
• Segment
• Two points and all the points between tme that are collinear with the two points.
• A polygon with four sides
• Perpendicular
• Geometric figures that intersect at 90° angles.
• Converse Statement
• A statement formed by exchanging the hypothesis and conclusion
• Altitude
• A perpendicular segment from a vertex to the base
• Base
• The side of a polygon that is closest to being horizontal
• Congruent
• Identical in shape and size
• Intersection
• The point or set of points in common to two geometric figures
• Acute Triangle
• A triangle in which all of its angles are less than 90°
• Midpoint
• The point on a segment that is the same distance from both of the endpoints
• Circle
• The set of all points that are equidistant from a single point
• Regular Polygon
• A polygon with all of its sides congruent to each other
• Polygon
• A closed figure in a plane, formed by connecting line segments endpoint to endpoint
• Degree
• A unit of measure for angles equivalent to of a rotation around a circle
• Angle Bisector
• A ray that has its endpoint at the vertex of the angle and that divides the angle into two congruent angles
• Inductive Reasoning
• The process of observing data, recognizing patterns, and making generalizations about those patterns
• Triangle
• A polygon with three sides
• Parallel
• Two figures that will never intersect
• Bisect
• To divide into two congruent parts
• Perpendicular Bisector
• A line that divides a line segment into two congruent parts and is perpendicular to the line segment
• Line
• An undefined term thought of as a straight, continuous arrangement of infinitely many points extending forever in two directions. Has length but no width or thickness.
• Plane
• An undefined term thought of as a flat surface that has length and width but no thickness
• Endpoint
• The point at either end of a segment or the first point of a ray
• Counterexample
• An example that shows a conjecture to be incorrect or a definition to be inadequate
• Undefined Term
• In a deductive system, figures whose general meaning is assumed
• Coplanar
• Two or more points lying on the same plane
• Two angles with a common side and vertex
• Right Angle
• An angle that is half of the straight angle
• Angle Measure
• The number of degrees between two rays with a common vertex
• Side
• One of the two rays that form an angle
• Collinear
• Two or more points on the same line