ANGLES

• Acute angle - measures less than 90 degrees

  
• Right angle - measures 90 degrees

  
• Obtuse angle - measures greater than 90 degrees but less than 180 degrees

  
• Straight angle - measures 180 degrees

  
• Reflex angle - measures greater than 180 degrees but less than 360 degrees

  
• Complete angle - measures 360 degrees

  
• Complementary angles - adds up to 90 degrees (right angle)
• Supplementary angles - adds up to 180 degrees (straight angles)
• Angle - formed by 2 rays with a common endpoint
• Degrees - is the measurement used to measure the size of an angle
• Parts of an angle

  A) arm

  B) arm

  C) vertex

  D) angle

  
• Adjacent angles - angles that share a vertex and a common side

  
• Vertical angles - angle formed by two intersecting lines that are opposite to each other; they have equal measures

  
• Congruent angles - angles that are related because they have the same measure