## Complementary & Supplementary Angles

A pair of angles is complementary if the sum of their measures add up to 90 degrees.

If two complementary angles are adjacent (i.e. have a common vertex and
share a side, but do not have any interior points in common) their non-shared
sides form a right angle.

A pair of angles is supplementary if their measurements add up to 180 degrees.

If the two supplementary angles are adjacent (i.e. have a common vertex and share a
side, but do not have any interior points in common) their non-shared sides form
a straight line.