Addition
x + 4 = 25
x = 21
b - 2 = 6
b = 8
9v= 27
v = 3
The measure of an angle is 73°. What is the measure of its complementary angle?
17 degrees
opposite of addition
subtraction
a + 10 = 13
a = 3
d - 7 = 9
d = 16
7x = 63
x = 9
The measure of an angle is 81°. What is the measure of its supplementary angle?
99 degrees
opposite of subtraction
addition
n + 8 = 15
n = 7
k - 10 = 30
k = 40
5e = 40
e = 8
The measure of an angle is 52°. What is the measure of its complementary angle?
38 degrees
opposite of multiplication
division
x + 10 = 20
x = 10
x - 25= 30
x = 55
10m = 30
m = 3
The measure of an angle is 138°. What is the measure of its supplementary angle?
42 degrees
opposite of division
multiplication
c + 4 = 12
c = 8
a - 20 = 25
a = 45
12y = 48
The measure of an angle is 54°. What is the measure of its complementary angle?
36 degrees
opposite of + 5
- 5