Always, Sometimes, or never:
A. The sum of the measures of two supplementary angles is 180°
B. The sum of complimentary angles is 180°.
C. Two adjacent angles are complementary.
A. Always - The definition of supplementary angles is that their sum is always 180°, so this statement is always true.
B. Never - The definition of complementary angles is that their sum is always 90°, not 180°, so this statement is never true.
C. Sometimes - Two adjacent angles are angles that share a common side and vertex. If the sum of these two angles is 90°, then they are complementary. However, if the sum is any other value, they are not complementary. Therefore, this statement is sometimes true depending on the specific angles in question.