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Foundations for 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
acute angle   show
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acute triangle   show
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angle   show
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show The point about which a figure is rotated.  
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show Two angles whose measures add up to 90 degrees.  
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congruent   show
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correspondence   show
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show A triangle with three congruent sides.  
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image   show
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show A triangle with at least two congruent sides.  
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line   show
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line of symmetry   show
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line symmetry   show
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obtuse angle   show
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obtuse triangle   show
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parallel lines   show
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show A quadrilateral with two pairs of parallel sides.  
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perpendicular lines   show
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show A flat surface that extends forever.  
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show An exact location in space.  
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show A close plane figure formed by three or more line segments that intersect only at their endpoints.  
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show A part of a line that starts at one endpoint and extends forever.  
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rectangle   show
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show A transformation of a figure that flips the figure across a line.  
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show A polygon with congruent sides and angles.  
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show A regular polygon is repeated to fill a plane.  
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show A parallelogram with all sides congruent.  
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right angle   show
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right triangle   show
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rise   show
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show A transformation in which a figure is turned around a point.  
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rotational symmetry   show
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show The horizontal change when,the slope of a line is expressed as the ratio rise/run, or "rise over run".  
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scalene triangle   show
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show A part of a line between two endpoints.  
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show A measure of the steepness of a line on a graph; the rise divided by the run.  
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square   show
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supplementary angles   show
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tessellation   show
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transformation   show
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translation   show
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transversal   show
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trapezoid   show
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show The measures of the angles in a triangle add up to 180 degrees.  
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vertical angles   show
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Created by: bookannelid
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