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words for Chapter 8 Test

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