Find the Missing Angle
What's my complement?
What's my supplement?
Angle Relationships
Missing Angles in Triangles
100
Vertical Angles:

(3 + 5x)

73

x=14 degrees

100
40 degrees
What is 50 degrees?
100
100 degrees
What is 80 degrees?
100
The equation 30 + x = 90 shows this relationship.
What is complementary?
100
Angles:

18, 72, x

x=90 degrees
200
Complementary Angles:

(3x + 8)

(6x +1)

x= 9 degrees


35 degrees

55 degrees

200
60 degrees
What is 30 degrees?
200
60 degrees
What is 120?
200
40 + 140 = 180 degrees shows this angle relationship.
What is supplementary?
200
Angles:

(7x - 5), 72, 43

x=10


65 degrees

300
Supplementary Angles:

(2x + 1)

89

x= 45 degrees


91 degrees

300
37 degrees
What is 53 degrees?
300
47 degrees
What is 133 degrees?
300
2x + 6 = 3x shows two angles that are congruent because they are across from each other and this relationship
What is vertical angles?
300
Angles:

(4x + 1), 77, 42

x=15


61 degrees

400
Full Angles:

23

(x - 30)

245

x=122 degrees


92 degrees

400
x
What is 90 - x?
400
90 degrees
What is 90?
400
This relationship describes two congruent angles that are on the same side of the transversal and match up exactly by sliding one over the other without turning.
What are corresponding angles?
400
Angles:

(11x + 2), 116, 29

x=3 degrees


35 degrees

500
Full angles:

(x + 8)

(x - 5)

(3x +2)


x=71 degrees


79 degrees

66 degrees

144 degrees

500
5x
What is 90 - 5x?
500
7x
What is 180 - 7x?
500
This relationship describes two congruent angles that are on the different sides of the transversal and match up exactly by turning one around over the other.
What are alternate interior or exterior angles?
500
Angles:

(29x - 1), 117, 35

x=1 degree


28 degrees

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