There's lots of useful things you can discover when parallel lines are cut by a transversal, most of them having to do with angle relationships. Corresponding angles are congruent, alternate interior angles are congruent, same side or consecutive interior angles are supplementary, alternate exterior angles are congruent, and vertical angles are congruent.
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Transversal lines cut through or touch parallel lines as for example support sleepers on a rail track or transversal supports on a gate
yes
Congruent
m<1=(5x-35) m<=(x+65)
Eight angles are formed - four for each line that the transversal cuts through. 2*4=8. Hope this helps!