vertical

linear pair

corresponding

complementary

 $\angle1\ and\ \angle8$  

 $\angle3\ and\ \angle7$  

 $\angle4\ and\ \angle5$  

 $\angle2\ and\ \angle5$  

 $\angle1\ and\ \angle8$  

 $\angle3\ and\ \angle7$  

 $\angle4\ and\ \angle5$  

 $\angle2\ and\ \angle5$  

 $\angle1\ and\ \angle8$  

 $\angle3\ and\ \angle7$  

 $\angle4\ and\ \angle5$  

 $\angle2\ and\ \angle5$  

 $\angle1\ and\ \angle8$  

 $\angle3\ and\ \angle7$  

 $\angle4\ and\ \angle5$  

 $\angle2\ and\ \angle5$  

 $180\degree$  

 $65\degree$  

 $115\degree$  

 $65\degree$  

 $180\degree$  

 $115\degree$  

 $131\degree$  

 $180\degree$  

 $49\degree$  

 $131\degree$  

 $180\degree$  

 $49\degree$  

$5x-8=3x+32$ because "if ll lines, then alternate exterior angles are equal".

$5x-8+3x+32=180$ because "if ll lines, then consecutive interior angles are supplementary".

$2x-10=4x+16$

$2x-10+4x+16=180$

Parallel lines have the same slope.

Parallel lines intersect at one point.

Perpendicular lines form a right angle.

Corresponding Angles

Alternate Interior Angles

Alternate Exterior Angles

Consecutive Interior Angles

Corresponding Angles

Alternate Interior Angles

Alternate Exterior Angles

Consecutive Interior Angles

8x - 17 + 5x +19 = 180 because "if ll lines, then consecutive interior angles are supplementary".

8x - 17 = 5x + 19 because "if ll lines, then alternate interior angles are equal".

8x - 17 = 5x +19 because "if ll lines, then corresponding angles are equal".

12x - 19 + 4x +1=180 because "if ll lines, then consecutive interior angles are supplementary".

12x - 19 = 4x +1 because "If ll lines, then corresponding angles are equal".