Parallel Lines & Transversals

$$\angle7$$

$$\angle4$$

$$\angle6$$

$$\angle2$$

$$\angle7\ and\ \angle8$$  

$$\angle2\ and\ \angle3$$  

$$\angle1\ and\ \angle7$$  

$$\angle6\ and\ \angle4$$  

$$\angle3$$

$$\angle1$$

$$\angle6$$

$$\angle2$$

alternate interior angles

linear pair

corresponding angles

vertical angles

$$\angle4$$  

$$\angle5$$  

$$\angle8$$  

$$\angle7$$  

Corresponding angles

Consecutive interior angles

Alternate interior angles

alternate exterior angles

Corresponding angles

Same-side interior angles

Alternate interior angles

Same-side exterior angles

a = 140

b = 140

c = 140

d = 140

Consecutive Interior

$$\angle7$$

$$\angle5$$

$$\angle3$$

$$\angle2$$

$$27\degree$$   

$$153\degree$$

$$63\degree$$  

$$90\degree$$  

70 degrees

20 degrees

110 degrees

180 degrees