Angles

• Acute angle


  Measures less than 90° at the vertex
• Obtuse angle


  Between 90° and 180°
• Right angle


  Precisely measures 90° at the vertex
• Straight angle


  Measures exactly 180°
• Reflex angle


  Measures between 180°- 360°
• Complete angle


  Measures 360°
• Complementary angles


  Angles that add up to 90° (a right angle)
• Supplementary angles


  Angles that add up to 180° (a straight angle)