Question

Another question :)

Answer 1

Keep in mind these two things:

1) Sum of intertior angles fo a triangle? 180º
2) Sum of supplementary angles? 180º

Answer 2

k that doesnt help me im really stupid lol.

Answer 3

1) Never say that again.
2) One purpose of the teaching of mathematics is to train you to think in a more organized fashion.

Thus, everything we know needs to MEAN SOMETHING.

When we see the problem at hand, and we know the sum of the interior angles is 180º, thes needs to MEAN \(m\angle(RST)+m\angle(STR)+m\angle(TRS) = 180^{\circ}\) in your brain and in your thinking.

When we see the problem at hand, and we know the sum of the supplementary angles is 180º, thes needs to MEAN \(m\angle(STU)+m\angle(STR) = 180^{\circ}\) in your brain and in your thinking.

It's not supposed to jump out and bite you. You have to mull it over and see what it means. Admittedly, not everyone thinks this way naturally. That's fine. We need people to think other ways. However, in the study of mathematics, we need to be a little more formal in our thinking.