In geometry vertical angles are congruent, meaning they have the same degree measure. you see these when two straight lines form and x shape. angles that are opposite one another are called vertical angles. if two of these congruent angles have the same degree measure and angle 1 is (3x+10) degrees and angle 2 is (5x-4) degrees, set the expressions equal to one another and find the degree measure. hint: don't just solve for the variable x, you have to solve for degree measure by substitution. do so in both expressions as a way to check your work. the degree measures should be the same if you solved for the variable correctly