Determine if each of the following statements is always true, sometimes
true or never true.
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 true. Two angles are supplementary if the sum of their measures is 180°.
B. never true. Two angles are complementary if the sum of their measures is 90°.
C. sometimes true. Two angles are adjacent if they share a common vertex and side. They can only be complementary if the sum of their measures is 90°, which is not always the case for adjacent angles.