Angle Relationships

How many degrees is x ?

Classify the angles

• supplementary

• complementary

What equation should I use to solve for y?

• 77 + y = 90

• 77+y=180

Solve for y

Find the complement of the angle measuring 63 degrees

• 27

• 117

• 17

• 37

Answer explanation

Complementary angles add up to 90 degrees

so 63 + ? = 90

? = 27

Find the supplementary angle of the angle measured at 125 degrees

• 35

• 65

• 55

• 90

Answer explanation

supplementary angles add up to 180 degrees

125 + ? = 180

? = 180-125 = 55

State whether 36 degrees and 54 degrees are complementary or not

• yes

• no

Answer explanation

complementary angles add up to 90 degrees

36 + 54 = 90 degrees

State whether 33 and 47 are complementary or not

• yes

• no

Answer explanation

33 + 47 = 90 degrees

complementary angles add up to 90 degrees

What is our equation set up needed to solve for x?

• 72 + x = 180

  x = 108

• 72 + x = 90

  x = 18

How do we set up the problem in order to solve for x?

• x + 68 = 90

  x= 12

• x + 68 = 180

  x= 112