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math that is 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
Adjacent Angles   Angles that share a vertex and a side but have no interior points in common  
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Angle Bisector   A ray that divides an angle into angles of equal measure  
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Midpoint   The point that divides the segment into two segments of equal length  
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Perpendicular Bisector   Lines that intersect to form right angles  
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Plane   A flat surface that extendsn indefinely in all directions  
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Regular Polygon   A polygon with all the sides congruent and all the angles congruent  
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Segment   Two endpoints and all the points of the line between endpoints  
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Segment Bisector   A line, segment, or ray that goes through the midpoint of a segment  
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Acute Angle   an angle with a measure between 0 and 90 degrees  
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Acute triangle   Has 3 acute angles  
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Angle   formed by 2 rays with a common endpoint called a vertex  
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Arc   part of a circle  
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Central angle   an angle whose vertex is the center of a circle that equals a sum of 360 degrees.  
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Chord   a segment that has both endpoints on a circle  
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Circle   the set of points in a plane that are all the same distance from a given point called the center  
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Circle graph   a graph of data where the circle represents the whole  
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Compass   a geometric tool used to draw circles or arcs  
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Complementary angles   2 angles that are complimentary if the sum of their measures is 90 degrees  
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Congruent angles   angles thhat have all the same length  
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congruent polygons   2 polygons that are congruent if they have exactly the same shape and size  
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Congruent sides   have the same length  
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decagon   a polygon with 10 sides  
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Diameter   a segment that passes through the center of a circle and has both endpoints  
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Equilateral triangle   a triangle  
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hexagon   a ploygon with 6 sides  
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intersecting lines   2 or more lines that cross each other  
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irregular polygon   a plygon with sides that are not all congruent and/or angles that are not all congruent  
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isosceles triangle   a triangle with at least two congruent sides  
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Line   a series of points that extends in 2 opposite directions without end  
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Midpoint   the point that divides the segment into two segments of equal length  
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obtuse angle   an angle with a measure greater that 90 degrees and less than 180 degrees  
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obtuse triangle   a triangle with an obtuse angle  
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octagon   a ploygon with 8 sides  
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