Geometry · Points, Lines & Angles
Adjacent Angles
HSG-CO.A.1
Definition
Two angles that share a common vertex and side but have no interior points in common.
Examples
- Angle 1 and angle 2 share a vertex and a side without overlapping.
- Two angles that together form a straight line are adjacent angles.
Key rule
Adjacent angles share a vertex and a side but never overlap.
Memory hook
Next-door angles — sharing a side, not overlapping.