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Geometry Vocabulary

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Term
Definition
Vertical Angles   A pair of opposite congruent angles formed by intersecting lines.  
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Supplementary Angles   Angles whose measures have a sum of 180°  
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Straight Angle   An angle that measures exactly 180°  
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Right Angle   An angle that measures exactly 90°  
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Congruent Angle   Angles that have the same measure  
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Acute Angle   An angle that measures less than 90°  
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Adjacent Angles   Angles in the same plane that have a common vertex and a common side but do not measure the same.  
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Obtuse Angles   An angle that measures more than 90°  
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Complementary Angles   Two angles whose measures add up to 90°  
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Perimeter   The length around a 2D shape.  
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Area   The amount of 2D space taken up by an object.  
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Diameter   A line segment that goes through the center of a circle.  
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Volume   The amount of 3D space occupied by a figure.  
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Surface Area   The area needed to cover a 3D object  
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Ray   A line that has an endpoint and extends in one direction.  
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Radius   The distance from the center of a circle to a point on the circle.  
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