vertical angle
Plural
vertical angles
1
one of a pair of opposite angles made by two intersecting lines, which are always equal
- Vertical angles are always congruent to each other.
- The theorem stating that vertical angles are equal is a fundamental concept in geometry.
- In the diagram, angle A and angle B are vertical angles and thus have the same measure.
- When proving the equality of vertical angles, you can use the properties of intersecting lines.
- If one vertical angle is 45 degrees, the opposite vertical angle must also be 45 degrees.