7th Grade · Geometry
Vertical Angles
7.G.B.5
Definition
The pair of non-adjacent angles formed when two lines intersect. Vertical angles are always congruent (equal in measure).
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- If ∠1 = 65°, then ∠3 (its vertical angle) = 65° too.
- ∠2 = 180° - 65° = 115° (linear pair with ∠1).
Key rule
Vertical angles are formed across from each other at an intersection and are always equal.
Memory hook
Angles across the X from each other match.