Complementary Angles
When two adjacent or nonadjacent angles have a total measurement of 90°
they are complementary angles.
You can probably see that these are similar to supplementary angles,
except complementary angles add to 90° instead of to 180°. The following
two illustrations show examples of adjacent complementary anglesand
non-adjacent complementary angles.
m∠ROQ + m∠QOP = 90° m∠OTS + m∠TSO = 90°
∠ROQ and ∠QOP are ∠OTS and ∠TSO are
adjacent complementary angles nonadjacent complementary
angles
Supplementary Angles
When two adjacent or nonadjacent angles have a total measure of 180° they
are supplementary angles.
m∠MOL + m∠LON = 180° m∠XUV + m∠UVW = 180°
∠MOL and ∠LON are ∠XUV and ∠UVW are non-
adjacent supplementary angles adjacent supplementary angles
50 °
130 °
U X
MLV W
K N
68 °
0
112 °
27
O
RQ P
63
O
T R
S
45
45
45
45
501 Geometry Questions