Language of Math
Complementary Angles - Angles whose
sum is 90º .
a
b
ma  mb  90
x
y
mx  my  90
Complementary
angles do not
have to be
adjacent.
Language of Math
Supplementary Angles - Angles whose
sum is 180º.
k
t
mk  mt  180
b
c
mb  mc  180
Supplementary
angles do not
have to be
adjacent.
Classifying Pairs of Angles
Using Complementary and
Supplementary Angles
Tell whether the angles are complementary
or supplementary. Then find the value of n.
1)
n   (2n  30)  90
n
(2n  30)
complementary
3n  30  90
30  30
3n  60
3 3
n  20
Using Complementary and
Supplementary Angles
Tell whether the angles are complementary
or supplementary. Then find the value of n.
(4n  30)  (n  10)  180
2)
(4n  30)
(n  10)
supplementary
5n  20  180
20  20
5n  160
5
5
n  32
Practice
Turn to Page 150 in your RAPJ
and do ALL problems