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# Geometry 8.1

TermDefinition
Endpoints 2 points on any line
Ray the subset of a line that contains a specific point (the endpoint) and all the points on the line that are on the same side of that point
Intersect wherever 2 lines meet or where 2 lines have a point in common
Perpendicular where 2 intersecting lines form right angles
Concurrent where 3 or more lines intersect at a single point
Parallel where 2 lines lie in the same plane and never intersect
Complementary Angles the sum of the measure of 2 angles equals 90 degrees
Supplementary Angles the sum of the measure of 2 angles equals 180 degrees
Hand-Eye Coordination One aspect of spatial thinking. The ability of the vision system to coordinate the information received through the eyes to control, guide, and direct the hands in the accomplishment of a given task.
Figure-Ground Perception The ability to identify a figure against a complex background.
Perceptual Constancy The ability to recognize figures and objects when they are not in their familiar orientation.
Visual Discrimination The ability to find similarities and differences between or among objects.
Visual Memory Deals with the person's ability to describe or draw accurately, an object that is no longer in view.
Point Geometrically, has no dimension (length or width), but it does have a location.
Right Angle An angle whose measurement is 90 degrees.
Acute Angle An angle whose measure is less than 90 degrees.
Obtuse Angle An angle whose measure is greater than 90 degrees but less than 180 degrees.
Line straight and extends infinitely in two directions
Plane A flat surface that extends infinitely in all directions.
Collinear Points Points that lie on the same line. Any two points are collinear.
Noncollinear Points three (or more) points that do not lie on a single line
Coplanar Points two or more points that lie on a single line
Line Segment A subset of a line that contains two points of the line and all points in between those points.
Straight An angle whose measure is 180 degrees.
Reflex An angle whose measure is greater than 180 degrees but less than 360 degrees.
Skew Two lines that do not intersect because they do not lie in the same plane.
Angle The union of two rays that have a common endpoint
Vertex The common endpoint of two rays.
Side Each of the rays of the angle
Interior The angle formed inside of a shape
Exterior
Vertical angles When two lines intersect, four angles are formed. The angle that are opposite of each other are vertical angles.
Created by: math1420

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