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Geometry 

  

Terms + Definitions :  Angles

Angle - An angle is created by two rays that share an endpoint (for more on rays, see basic geometry terms.)  

Vertex of an Angle - The point where the angle's two rays intersect.  

Sides of an Angle - The two rays that form the angle.  

Acute Angles -An angle measuring between 0 and 90 degrees.  

Obtuse Angles - An angle measuring between 90 and 180 degrees.  

Right Angles - 90 degree angles.  

Complementary Angles - If the sum of the degrees of two angles equals 90 degrees then the two angles are referred to as complementary.  

Supplementary Angles - If the sum of the degrees of two angles equals 180 degrees then the two angles are referred to as supplementary.   

Vertical Angles - Two angles whose sides from two pairs of opposite rays.  

Interior Angles - Angles lying on the interior, or "inside", of a set of lines or figure.  

Alternate Interior Angles - When a pair of parallel lines is intersected by a third line, congruent angles (angles of the same size) are formed on each parallel line.  That is, the four angles on parallel line A will be the same as on parallel line B.  Alternate Interior Angles are interior angles ("inside" angles) that lie on different parallel lines and on opposite sides of a transversal (see basic geometry terms for a definition of transversal).   

Alternate Exterior Angles - When a pair of parallel lines is intersected by a third line, congruent angles (angles of the same size) are formed on each parallel line.  That is, the four angles on parallel line A will be the same as on parallel line B.  Alternate Exterior angles are exterior angles ("outside" angles) that line on different parallel lines and on opposite sides of a transversal (see basic geometry terms for a definition of transversal).   

Corresponding Angles - Angles that are in the same location relative to the nearest parallel line.  

Bisector - A ray that divides an angle into two separate angles.  

Perpendicular Lines - Two lines that meet to form a right angle are referred to as perpendicular lines.  

 

 

 

 

 
 

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