Question

http://prntscr.com/agp9ra

Answer 1

What is your question?

Answer 2

Isn't my question on the screenshot?

Answer 3

Yeah so, do you want me to check your work...? or what...

Answer 4

The first 3 look good

Answer 5

The 4th one, I don't know what the choices are

Answer 6

The choices are 90, 180, and 360.

Answer 7

The steps are correct.

The very last step is what is being proved.

The substitutions were to show that the sum of the interior angles of a triangle is 180.

Answer 8

Yeah

Answer 9

@Gokuporter What do you think is the correct choice out of those three options?

Answer 10

Look back at the proof at what you are proving.

Answer 11

180

Answer 12

Thanks for the help. :)

Answer 13

Correct, and no problem :)