Angle Pairs and Circles

Vertical angles are always

• acute

• total 180 degrees

• congruent (equal measures)

• adjacent angles

What is the value of x?

• 37

• 72

• 108

• 18

Find the missing angle.  Find x.

• 20^o

• 70^o

• 160^o

• 180^o

Mathematical Equivalence

ON

Solve for x:

Mathematical Equivalence

ON

The image shows a circle centered at point O. Angle AOB measures 50 degrees. What is the measure of angle ACB? (a)  

• 25 degrees

• 40 degrees

• 50 degrees

• 100 degrees

Think about if the angles are equal or if they add up to 180. Solve for x. Plug it in.

Mathematical Equivalence

ON

Find the value of x.

Mathematical Equivalence

ON

Supplementary angles always add up to