if angle 1 = 31° and is angle 4 = 31 and angle 3 5 and 2 are unknown, what is a he measure of angle 2? vertical angles

Vertical angles are always congruent, meaning they have the same measure. In this case, angle 1 and angle 4 are vertical angles and both have a measure of 31°. Since angle 2 is a vertical angle to angle 1, it must also have a measure of 31°.