7-2: Complementary and Supplementary Angles
Warm-up:
What
is
Complementary​
?
Guide Practice
Page 538 #1-4
m
∠1 + m∠2 =
90 °
Two angles are
complementary ​
if
the sum of their
measures is 90°.
1
2
What
is
Supplementary​
?
m
∠3 + m∠4 =
180°
Symbol:
3
4
Two angles are
supplementary
if
the sum of their
measures is 180°.
∠
The symbol m 1
means the ​
measure
of angle 1.
Example 1-2a,b:
Page 544
Identify each pair
of angles as
complementary,
supplementary, or
neither:
a)
85° 90°
b)
75°
15
°
Find a
Measure:
Missing
Use
angle
relationships to find
missing angles
Example 3-4c:
Page 545
Find the value of x:
x°
x°
Example 5d:
Page 546
Summary:
What is the measure of
the angles given by the
opening of the scissors?