What is a requirement of complementary angles?
Complementary angles must be adjacent.
Complementary angles must be vertical.
The measures of complementary angles must add up to 90°.
The measures of complementary angles must add up to 180°.
Complementary angles must be adjacent.
Complementary angles must be vertical.
The measures of complementary angles must add up to 90°.
The measures of complementary angles must add up to 180°.