$\angle2\ and\ \angle6$ 

 $\angle10\ and\ \angle11$ 

 $\angle10\ and\ \angle12$ 

 $\angle4\ and\ \angle6$ 

corresponding angles

a linear pair

vertical angles

alternate exterior angles

alternate exterior angles

alternate interior angles

vertical angles

corresponding angles

adjacent angles

a linear pair

same-side interior angles

corresponding angles

$\angle2\ and\ \angle3$

$\angle8\ and\ \angle9$

$\angle1\ and\ \angle4$

$\angle14\ and\ \angle15$

 $\angle5\ and\ \angle6$ 

 $\angle5\ and\ \angle3$ 

 $\angle5\ and\ \angle12$ 

 $\angle5\ and\ \angle13$