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A point is a location. A point has no size. A point is represented by a small dot. 


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A line is an infinite set of points that extends in two opposite directions. 


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A pane is a flat surface that has no thickness. A plane extends without end in all directions. 


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A segment is part of a line with two end points in between. 


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A ray is part of a line consisting of one end point and all points on one side of the end point. 


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Two lines on a plane that never meet. They are always the same distance apart. 


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Two nonparallel lines in space that do not intersect are called skew lines 


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Adjust any line segment below by dragging an orange dot at its ends. The other line segment will change to remain congruent with it. 


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Two Angles are Supplementary if they add up to 180 degrees. 


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Two Angles are Complementary if they add up to 90 degrees (a Right Angle). 


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The amount of turn between two straight lines that have a common end point (the vertex). 


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the branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogs. 

