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Who am I?
What's my complement?
What's my supplement?
Angle Relationships
Angle Definitions
100
a right angle
What is an angle whose degree measure is exactly 90?
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 that add up to 90 degrees
What are complementary angles?
200
an acute angle
What is an angle whose degrees measure is less than 90?
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 that add up to 180 degrees
What are supplementary angles?
300
an obtuse angle
What is an angle whose degree measure is greater than 90 and less than 180?
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 that are across from each other and congruent are called __________.


Draw these angles.

Vertical Angles

400
a straight angle
What is an angle whose degrees measure is exactly 180 and forms a straight line?
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

Draw 2 Adjacent Angles.

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500
a reflex angle
What is an angle whose degree measure is greater than 180 and less than 360?
500

Angles A and Angle B are Complementary.

Angle A = 20

Angle B = 3x

What is the value of x?

20 + 3x = 90

x = 23.3 degrees

500

Angles A and Angle B are Supplementary.

Angle A = 30 

Angle B = 5x

What is the value of x?

5x + 30 = 180

x = 30 degrees

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

The angles of a triangle always have a sum of ____ degrees.

180