Warmups
4y  5
7
7
n
13 
7
Find three consecutive
integers whose sum is 96.
3-4 Angles and
Triangles
Objective: To find the
complement and supplement of
an angle
Complement
Complement: 2 angles whose sum is 90o
 Remember, sum means adding (+)

m 1  m 2  90
1
2
Examples
Find the complement of each angle:
1) 50o
2) 30°
1st angle = 50o
2nd angle = c
50 + c = 90
-50
-50
c = 40o
Examples (do with me)
3) (2x)o
4)
48o
TOO (with a partner):
Find the complement of each angle:
1) 130º
Answers:
1) NONE
2) (84 – x)º
2) (x + 6)º
If the answer is negative,
then there is “none!”
Supplement

Supplement: 2 angles whose sum is 180o
m 1  m 2  180
180o
Examples (do with me):
Find the supplement of each angle:
1) 130o
2) (x-20)°
1st angle = 130o
2nd angle = s
130o + s = 180o
-130
-130
s = 50o
TOO (with a partner):
Find the supplement of each angle:
1) 90º
Answers:
1) 90º
2) (142 – 4x)º
2) (4x + 38)º
Homework

Pg. 166 # 17-28 all
Math Lab Warmups (in notebook)
-6 + x = -18
1
-5
3 x=
3
9
5 5
p+ =
12 6
3(5x + 4) = 12x -18
Multiplication chart
See if you can beat your fastest time
 Everything away except for a PENCIL 
