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Math terms and their definitions: geometry

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Term
Definition
Line   A length that goes in two opposite directions without end  
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Ray   Has one endpoint and goes without end in one direction  
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Line Segment   A part of line with two endpoints  
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Plane   A flat surface that extends without end  
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Parallel Lines   Lines that never meet  
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Intersecting Lines   Lines that meet at a point  
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Angle   Formed by two rays with the same endpoint  
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Vertex   Point of intersection of the sides of an angle  
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Protracter   Tool to measure and draw angles  
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Degrees   Unit of measure for angles  
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Right Angle   Measures exactly 90 degrees  
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Acute Angle   Less than 90 degrees  
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Obtuse Angle   More than 90 degrees  
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Straight Angle   Measures exactly 180 degrees, a straight line  
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Complementary Angles   Add up to 90 degrees  
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Supplementary Angles   Add up to 180 degrees  
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Vertical Angles   Angles opposite each other when two lines intersect  
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