Adjacent Angles

Two angles are adjacent when they share a common side and a common vertex (corner point), and don't overlap.

Angle ABC is adjacent to angle CBD Because: they have a common side (line CB) they have a common vertex (point B) they don't overlap

What Is and Is Not an Adjacent Angle

Example: Clock Hands

Clock hands can often form adjacent angles between them, but can you think of times they won't?

Summary

Two angles are adjacent when they:

• share a common side
• share a common vertex
• don't overlap