Please help me, short proof problem
Use a paragraph proof to prove the same-side interior angles theorem.

Given: Segment A B is parallel to segment C D.
Prove: Same-side interior angles are supplementary.

Question

Please help me, short proof problem
Use a paragraph proof to prove the same-side interior angles theorem.

Given: Segment A B is parallel to segment C D.
Prove: Same-side interior angles are supplementary.

anonymous · Answer

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istim · Answer

Well, they would both add up to 180 degrees.

anonymous · Answer

Yeah but for some reason I'm totally stuck on the proof. This is what I've got so far, I just dont know how to elaborate and do even the next step:
Segment AB is parallel to segment CD.

istim · Answer

Erll, you can see that the those angles add up to 360, which is a circle.

anonymous · Answer

Hmm, so could it be like this:

Segment AB is parallel to segment CD. <1 and <2 equal 180 degrees, and <5 and <6 equal 180 degrees when added. Therefore, same-side interior angles are supplementary.