Two obtuse angles can be supplementary.

Observe the following pair of corresponding angles are equal or not.

$\angle 1 \& \angle 5$

Observe the following pair of corresponding angles are equal or not.

$\angle 2 \& \angle 6$

Observe the following pair of corresponding angles are equal or not.

$\angle 3 \& \angle 7$

Observe the following pair of corresponding angles are equal or not.

$\angle 4 \& \angle 8$

Observe the following pair of alternate interior angles are equal or not.

$\angle 3 \& \angle 5$

Observe the following pair of alternate interior angles are equal or not.

$\angle 4 \& \angle 6$

Observe the following pair of alternate exterior angles are equal or not.

$\angle 1 \& \angle 7$

Observe the following pair of alternate exterior angles are equal or not.

$\angle 2 \& \angle 8$