Angle pairs

Math

Definition

Special relationships between two angles based on their positions. Common pairs include complementary angles (sum to 90°), supplementary angles (sum to 180°), vertical angles (formed by intersecting lines, always congruent), and linear pairs (adjacent and supplementary).

Examples

  • Two angles measuring 35° and 55° are complementary because they sum to 90°
  • When two lines intersect, the vertical angles across from each other are always equal
Key Fact

Complementary = 90°, Supplementary = 180°, Vertical angles are congruent

Related Terms

Measuring angles Proving lines parallel Parallel and perpendicular lines Conditional statements

Study This Concept

Practice angle pairs with free review games in these units:

Geometry Unit 3: Parallel and Perpendicular Lines