Math

Angle pairs.

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

Real-world.

  • 1 Two angles measuring 35° and 55° are complementary because they sum to 90°
  • 2 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

Tangled up with.

Measuring angles → Proving lines parallel → Parallel and perpendicular lines → Conditional statements →
Studied in

1 unit use this concept.

Geometry Parallel and Perpendicular Lines →