Question

Which can be used to prove d perpendicular to t? I need an explanation on how to determine this.

Answer 1

@jim_thompson5910

Answer 2

we have this drawing

Answer 3

we know line s and line t are parallel because of these arrow markers

Answer 4

so that means these corresponding angles are congruent (ie equal)

Answer 5

so we know the angle made from lines t and d is 90 degrees

Answer 6

which is enough to prove that line t is perpendicular to line d (by the very definition of what perpendicular lines are)

Answer 7

So it would be Definition of Perpendicular Transversal Theorem

Answer 8

that sounds right