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How Are They Related? Angles can be related in many different ways. For example, angles with the same measure are congruent angles. Vertical angles, opposite angles formed when lines intersect, are congruent. Two angles that share a common ray and vertex are called adjacent angles. Two angles whose combined measures total 90 are complementary angles. Two angles whose combined measures total 180 are supplementary angles. Write whether each statement below is true or false. Then explain why it is true or why it is false. 1.