Our free Vertical Angles Calculator helps you quickly find the measure of unknown vertical angles. Simply input one known angle, and the calculator instantly provides its opposite vertical angle, leveraging the fundamental geometry principle that vertical angles are always equal. Ideal for homework, quick checks, or learning basic angle properties.
Formula:
When two straight lines intersect, they form two pairs of vertical angles. Vertical angles are always equal in measure. If you know the measure of one angle (A), its vertical angle (B) will have the same measure:
A = B
Where:
- A = The known vertical angle.
- B = The opposite vertical angle, which is equal to A.