Question

line r and line s are parallel, r is perpendicular to t. how do you prove that s is perpendicular to t?

Answer 1

if its across from each other

Answer 2

Do you know that all three lines are in the same plane?

Answer 3

yes

Answer 4

If you know that, then you can apply the theorem:

In a plane, if a line is perpendicular to one of two parallel lines, then it is perpendicular to the other one also.

Answer 5

i have to prove this by using only proofs, theorems, and postulates.

Answer 6

we did this last week

Answer 7

This is a theorem in my book:

In a plane, if a line is perpendicular to one of two parallel lines, then it is perpendicular to the other one also.

Answer 8

its what directrix
said

Answer 9

We proved it so that we could use it.

Have you not proved it yet? If not, then you will need to do so before you use it.

Answer 10

i have to prove it using two column proofs

Answer 11

so if you dont know the name of the postulate or the theorem, u can literally write it out

Answer 12

coreesponfing angles postulate

Answer 13

@sabrinarkitty Look at this link if you are going to prove the theorem.