Check it out! Add your answer and earn points. True or false the acute angles in a right triangle must be complementary. Vertical angles are always congruent, but congruent angles do not have to be vertical. Key Terms Look at the figure below where the lines intersect and the angles formed.You can see that the opposite angles are congruent. Vertical angles are non-adjacent angles and they are formed when 2 lines intersect. According to the same-side interior angle theorem, these two angle are always supplementary or the sum of measures of the two angles is equal to {eq}180^\circ {/eq}. b. always congruent. Opposite rays are collinear rays with a common endpoint and extend in the same direction. That is all. Congruent Angles Congruent Angles have the same angle (in degrees or radians). PLAY. Since $\beta$ is congruent to itself, the above proposition shows that $\alpha\cong\alpha'$. Supplementary angles are congruent. vertical angles are always congruent...they are two nonadjacent angles formed by intersecting lines. They don't have to point in the same direction. always. Finally, vertical angles are always congruent. They don't have to be on similar sized lines. Vertical angles are congruent..or equal in measure Definitions are reversible. Vertical angles are a. never congruent. c. congruent only when they are both obtuse angles. 1 See answer zuziolacamons is waiting for your help. These angles are congruent. True or false vertical angles are always congruent. Suppose $\alpha$ and $\alpha'$ are vertical angles, hence each supplementary to an angle $\beta$. True or false obtuse angles do not have complements. In the above given figure you can see two parallel lines are intersected by a transversal. Vertical angles, also known as opposite angles, are opposite angles formed by two intersecting lines.Vertical angles are ALWAYS congruent (angles that have the same measure) and tend to resemble bow ties. Any two angles with the same angle measurement are considered congruent by definition. d. congruent only when they are both acute angles. In vertical angles, all the pairs of the angles are opposite each other. STUDY. Now vertical angles are defined by the opposite rays on the same two lines. Aliza121 Aliza121 Vertical angles are congruent. never. Just the same angle. Whenever two lines intersect, they form two pairs of vertical angles. sometimes. Theorems are reversible. Vertical angles are always equal in measure, they are very special angle and they are congruent to one another. Always, Sometimes, Never. Vertical angles have a common vertex, but they are never adjacent angles. always.