What is the sum of supplementary angles?
\( 180^{\circ} \).
\( 45^{\circ} \).
\( 360^{\circ} \).
\( 90^{\circ} \).
Which angles are directly across from each other?
Corresponding angles.
Alternate interior angles.
Adjacent angles.
Vertical angles.
What is the relationship between \angle 1 and \angle 2 if they are vertical angles?
They are congruent.
They are complementary.
They are supplementary.
They are adjacent.
What is the sum of complementary angles?
270 degrees
180 degrees
60 degrees
90 degrees