1, two straight lines are cut by a third straight line. On the same side of the section line, on the same side of the section line, we call the angle of this positional relationship the congruence angle. The congruence angles are ∠ 1 and ∠5, ∠2 and ∠6, ∞ respectively.

2. Two straight lines are cut by a third straight line, and the two corners are on both sides of the cutting line and sandwiched between the two cut straight lines. Diagonal lines with this positional relationship are called inscribed angles. The inscribed angles are ∠ 3 and ∠ 5, ∠ 4 and ∠ 6 respectively.

3. Two straight lines are cut by a third straight line, between the two straight lines and next to the third straight line? Two angles are called ipsilateral internal angles. The ipsilateral internal angles are ∠ 3 and ∠ 6, ∠ 4 and ∠ 5 respectively.

And there is no parallel line on your topic, and there is no such angle!