Question

See attachment.

Answer 1

<15 vertical angles

Answer 2

<4 <1 alt int angles

Answer 3

<4 <12 opp angles of parallelogram

Answer 4

<12 <9 alt int angles

Answer 5

<9 <7 vertical angles

Answer 6

Wait....they only have to be equal to angle number 1. So i think we're done

Answer 7

Yes, I know, but all these angles are congruent to angle 1.
<15 is congr to <1 bec of vertical angles
<4 is congr to <1 bec of alt in angles
<12 is congr to <4 bec of opp angles of parallelogram, and since <4 is congr to <1, <12 is congr to <1
<9 is congr to <12 by alt int angles, so <9 is congr to <1
<7 is congr to <9 by vertical angles, so <7 is congr to <1

Answer 8

Oh, I apologize. I didn't understand that that was why. Thank you so much for your help!

Answer 9

You're welcome