Question

state the conditions when a transversal intersects two parallel lines

Answer 1

First, if a transversal intersects two lines so that corresponding angles are congruent, then the lines are parallel. ... The proposition continues by stating that on a transversal of two parallel lines, corresponding angles are congruent and the interior angles on the same side are equal to two right angles.

Answer 2

Right angles are formed where ever the transversal meets the parallels perpendicularly.Interior alt angles,Correspondin angles are also formed