Question

WHOEVER gives the CORRECT answer FIRST, gets brainliest answer and thanks

Answer 1

Yes, because they are similar(or you can call congruent), proved by SAS or simply HL.

Answer 2

For that to happen, they must be similar. Maybe you've heard of Thales theorem?

So, let's see how the ratio of vertical to horizontal is:

3/7 (in the first triangle)
9/21 (in the second triangle)

Is 3/7=9/21? Yup. So that it is the second one.