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5th grade geometry

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
Line   A set of points that form a straight path that extends infinitely in opposite directions.  
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Line segment   A part of a line marked by two endpoints, and it includes the endpoints and all the points on the line between them.  
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Ray   A part of a line that begins at an endpoint and extends infinitely in one direction.  
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Angle   Formed by two rays sharing a common endpoint.  
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Parallel lines   Lines that are equidistant (the same distance) from each other and in the same plane.  
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Perpendicular lines   Lines that intersect to form a right angle.  
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Oblique lines   Lines in the same plane that interesect to form nonright (acute or obtuse) angles.  
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Complementary angles   Two angles are complementary if the sum of their measures is 90 degrees.  
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Supplementary Angles   Two angles are supplementary if the sum of their measures is 180 degrees.  
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Congruent   Figures that are the same size and shape.  
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Polygon   A figure with 3 or more sides that has a closed shape, no tails and only one inside area.  
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Quadrilaterals   A shape with four sides.  
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Acute angle   An angle that is less than 90 degrees.  
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Obtuse angle   An angle that is greater than 90 degrees and less than 180 degrees.  
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Right angle   An angle that is 90 degrees.  
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Straight angle   An angle that is 180 degrees.  
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Line of symmetry   The fold line of a shape where both halves of the shape match exaclty.  
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Rotational symmetry   When a figure can be turned less than 360 degrees around a point and be in the same orientation as it started.  
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Created by: jharlor
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