angle 1 and angle 2 are vertical angles. angle 2 has a measure of 31 degrees.
what is the measure of angle 1 ?
enter your answer in the box.

Theorem:
Vertical angles are congruent.

If the angles are vertical angles, they are congruent.
Congruent angles have the same measure.

If <2 measures 31 deg, then <1 also measures 31 deg.