Types of Angles

• Acute:less than 90^o

• •Adjacent angles : two coplanar angles with a common side, a common vertex, and no common interior points.

• Central Angle of a circle
• Complementary: Two angles whose sum is 90 °
• Inscribed Angle of a circle

• •Linear pair of angles: angles that are supplementary and adjacent

• Obtuse:more than 90^o
• Supplementary: Two angles that add up to 180^o
• Parallel Line Angles: Angles formed by Intersecting lines (corresponding, alternate interior, alternate exterior, same side interior)
  • >>>Interactive Parallel lines cut by a transversal (and all the angles: corresponding, alternate interior and exterior)
• Right Angles: exactly 90 °
• Vertical Angles
  • Interactive Vertical Angles
• Supplementary Angles
  • Inteactive Supplementary Angles

Angles associated with more complex shapes

Angles and circles
• Angles formed by intersection of secants, tangents outside of a circle