## MusicTeacher 3 years ago does anyone understand proofs?

1. LolWolf

What do you need help on?

2. MusicTeacher

i just don't get how they work at all,,,

3. MusicTeacher

prove theorem 5-1: if two parallel planes are cut by a third plane, thenn the lines of intersection are parallel

4. MusicTeacher

given: planes CDE and ABF ae parallel. Plane ABC is a transversal intersecting both planes

5. LolWolf

I don't know what postulates and axioms you're working from, but here: We shall say that \(l\) is the line of intersection between \(ABC\) and \(CDE\). Proof: Both lines \(l\) and \(AB\) are on the plane \(ABC\). But, since \(l\) is also on plane \(CDE\), \(AB\) is on \(ABF\), and \(CDE \;\|\; ABF\), these will never meet. Thus, \(AB \;\|\;l\). Q.E.D.

6. MusicTeacher

is there an easy way to make these make sense??

7. LolWolf

Draw it out and then try to logically reason why it could be the case.

8. precal

Math is like music. We have to learn the basics of each one. The more you practice it, the easier it becomes.

9. LolWolf

Also, replacing all of the symbols with actual words or phrases, it helps out, quite a bit, if it all looks daunting at first.

10. MusicTeacher

they just don't make sense to me :'(

11. precal

you are in good company here but I have learn that talking about it helps. Just like in music, math also, has its patterns.

12. MusicTeacher

music makes sense!

13. LolWolf

They both do, you just have to learn each one (Trust me, I also play a few instruments, myself).

14. MusicTeacher

ok ty