Measuring Angles and Linear Pairs

$$\angle2\cong\angle4$$  

$$m\angle2+m\angle4=180\degree$$  

 are right angles

They are non-adjacent angles

$$\angle6\ and\ \angle4$$  are complementary (sum to $$90°$$  )

$$\angle6\ and\ \angle4$$  are supplementary (sum to  $$180°$$  )

$$\angle6\ and\ \angle4$$  are adjacent

$$\angle6\ and\ \angle4$$  form a linear pair

$$\angle3\ and\ \angle2$$  

$$\angle5\ and\ \angle7$$  

$$\angle2\ and\ \angle8$$  

$$\angle3\ and\ \angle5$$  

x = 118

x = 108

x = 28

x = 58

x = 62

20^o

70^o

160^o

180^o

37

72

108

18

$$\angle8\ \ and\ \angle7$$

$$\angle8\ and\ \angle6$$

$$\angle8\ and\ \angle5$$

$$\angle2$$  

$$\angle3$$  

$$\angle4$$  

$$\angle5$$  

$$\angle1$$  

$$\angle7\$$  and  $$\angle5$$  

$$\angle3\$$  and  $$\angle6$$  

$$\angle4$$  and  $$\angle8$$  

$$\angle2$$  and  $$\angle3$$  

$$\angle7\$$  and  $$\angle6$$  

$$\angle2\$$  and  $$\angle6$$  

$$\angle2\$$  and  $$\angle4$$  

$$\angle8\$$  and  $$\angle5$$