Angle Relationships

Angle Relationships

How are the angles related? Yes, we're stepping back.

https://www.youtube.com/watch?v=Qpq_XEeBBZw

Angle Relationships

• Vertical angles only touch at the vertex- they are EQUAL

• Supplementary angles share one side and make a striaght line. They add up to 180.

• Complementary angles form a right angle (see the little box). They add up to 90.

Supplementary Angles

• The two angles form a straight line so we know they are supplementary (and add up to 180).

• We will write an equation 79 + x = 180

• Solve the equation by subtracting 79 from both sides

• x = 101

Multiple Choice

What is the value of angle b?

• 27

• 63

• 117

Multiple Choice

What is the value of angle b?

• 26

• 64

• 116

Multiple Choice

What is the value of angle b?

• 52

• 128

• 38

Fill in the Blanks

Fill in the Blanks

Complementary Angles

• The two angles form a right angle so we know they are complementary (and add up to 90).

• We will write an equation 73 + x = 90

• Solve the equation by subtracting 73 from both sides

• x = 17

Multiple Choice

What is the value of angle x?

• 41

• 131

• 49

Multiple Choice

What is the value of angle x?

• 30

• 60

• 150

Multiple Choice

What is the value of angle x?

• 149

• 59

• 31

Fill in the Blanks

Fill in the Blanks