The lines are perpendicular is the assumption you would make to start an indirect proof for the statement “Two lines that are cut by a transversal so that alternate interior angles are congruent are parallel.”

Question

ganeshie8 · Answer

nope

ganeshie8 · Answer

you should start with :

Since we want to prove the lines are parallel, lets start by assuming the opposite of it is true, that is `the lines are not parallel`...

ganeshie8 · Answer

this analogy may help : 
opposite of black is not white -  it could be red, green or any other color...