Angles Classified by Type, An Alphabetical Listing of Mathematical 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)
Triangle's Angles
- Remote and Exterior Angles of a Triangle
- Interior Angle's of Triangle
Right Angles: exactly 90°
Vertical Angles
- Interactive Vertical Angles
Supplementary Angles
- Interactive Supplementary Angles
Angles Associated with More Complex Shapes
- Angles and Circles

Types of Angles