Which Polygon Sides are Parallel?
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http://www.lerc.nasa.gov/Other_Groups/K12/p_test/math_9/math_p_q24.html  


NASA Lewis Learning Technologies Project  
Which of these line segments are parallel? Two adjacent sides of a triangle; Two adjacent sides of a pentagon; Two opposite sides of a rectangle; Two radii of a circle. A diagram and a detailed answer are provided. From NASA's 9th Grade Math Proficiency Test.  


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Math Topics:  Euclidean Plane Geometry 
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