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Geometry Words

words for Chapter 8 Test

Point A location in space
Line A straight path that continues in two directions without ending
Line segment A straight path that has two endpoints.
Ray A straight path that starts at one endpoint and continues in one direction without end.
Angle Figure made by two rays with a common endpoint.
Vertex The center point of an angle
Protractor A tool used to measure the degrees of angles
Acute An angle that is less than 90 degrees
Obtuse An angle that is more than 90 degrees
Right An angle that is exactly 90 degrees, a square corner
Vertical angles Angles that are opposite of each other, they are also congruent
Congruent Having the same size and shape or measurement
Adjacent angles Angles that share a common side or ray
Supplementary angles angles that add to 180 degrees together
Complementary angles Angles that add to 90 degrees together
Skew lines Lines in different planes that never cross
Intersecting lines Lines that cross at one point
Parallel lines Lines in the same plane that never cross
Perpendicular lines Lines that cross at 90 degree angles
Equilateral triangle A triangle with 3 equal sides
Scalene triangle A triangle with 0 equal sides
Isosceles triangle A triangle with exactly 2 equal sides
Rhombus A quadrilateral with 4 equal sides
Square A quadrilateral with 4 equal sides and 4 right angles
Trapezoid A quadrilateral with exactly 2 parallel sides
Rectangle A quadrilateral with two pairs of parallel sides and 4 right angles
Parallelogram A quadrilateral with two pairs of parallel sides
Quadrilateral A polygon with 4 sides
Triangle A polygon with 3 sides
Pentagon A polygon with 5 sides
Hexagon A polygon with 6 sides
Octagon A polygon with 8 sides
Polygon A simple, closed, plane figure with at 3 or more straight sides
Translation A movement of a figure along a straight line
Rotation A movement of a figure around a point
Reflection A movement of a figure in which the figure is “flipped” - the location and position changes
Line of symmetry The line on a figure which divides the figure so that the two parts are “mirror” images of each other. If folded on this, both parts will match exactly.
Plane A flat surface that extends without end in all directions
Geometry The study of “Earth Measurement” involving shapes, angles, points, lines
Circle a set of all points in a plane that are equal distance from a point called the center
Created by: lseman