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a figure formed by two rays that have a common endpoint. 


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an exact location in space, usually represented by a dot. 


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a straight path in a plane, extending in both directions with no endpoints. 


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a part of a line between two endpoints 


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a part of a line; it begins at one endpoint and extends forever in one direction. 


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a flat surface that extends without end in all directions. 


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a special angle formed by perpendicular lines and equal to 90 degrees. 


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an angle that measures less than 90 degrees. 


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an angle whose measure is greater that 90 degrees and less than 180 degrees. 


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a closed plane figure formed by three or more line segments. 


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an angle that measures 180 degrees. 


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lines in a plane that are always the same distance apart. 


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Lines in a plane that cross at exactly one point. 


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two lines in a plane that intersect to form right angles. 


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Geometric figures can be transformed by translating, rotating, or reflecting them. These big words just meant that you can slide, turn, and flip figures. The new figures are congruent to the orginal figures. 


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When you translate a figure, you slide it in one direction without turning it or flipping it (slide). 


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When you rotate a figure, you turn it around a point. You can rotate a figure clockwise or counterclockwise. (Turn) 


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When you reflect a figure, you flip it over a line. Think of reflection as the mirrorimage of a figure. You can reflect a figure over a horizontal or vertical line. (Flip) 

