/sci/ - Science & Math

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Anonymous Sat Apr 23 08:18:57 2011 No.2935318 [Reply] [Original]

Underagefag here.

I need to prove Thales theorem (Intercept theorem) and I can't wrap my head around it. Could someone help or at least clarify how to do claim 1 of the proof ?

Much appreciated. Pic unrelated

>>	Anonymous Sat Apr 23 10:01:57 2011 No.2935542 Shameless self bump

>>	Anonymous Sat Apr 23 10:04:57 2011 No.2935553 http://en.wikipedia.org/wiki/Thales%27_theorem#Proof

>>	Anonymous Sat Apr 23 10:13:57 2011 No.2935587 >>2935553 Thanks, but I meant the Intercept Theorem (also called Thales) not that one.

>>	Anonymous Sat Apr 23 10:33:57 2011 No.2935654 It's the last one I have to prove and I can move to more advanced maths. Any suggestion ?

>>	Anonymous Sat Apr 23 10:44:57 2011 No.2935687 This is just based on similar triangles. What exactly is the issue? http://en.wikipedia.org/wiki/Intercept_theorem

>>	Anonymous Sat Apr 23 10:45:57 2011 No.2935690 http://en.wikipedia.org/wiki/Intercept_theorem#Proof

>>	Anonymous Sat Apr 23 10:57:57 2011 No.2935720 I don't get the first step. (The congruent triangles : equal altitudes)

>>	Anonymous Sat Apr 23 11:06:57 2011 No.2935758 You're aware that triangles with the same height and base length have the same area, correct? The distance between parallel lines is the height in this case, and length CA is the base. Add triangle SCA to each of those and you get the next equivalence.

>>	Anonymous Sat Apr 23 11:16:57 2011 No.2935805 File: 105 KB, 589x757, 1303515651662.jpg [View same] [iqdb] [saucenao] [google] I got it now. Thanks! Btw, any tips on where to begin with mathematical logic ? Explicitly logic operations and statements. I've looked on khanacademy

>>	Anonymous Sat Apr 23 11:22:57 2011 No.2935825 This is probably the best thing I can find in a pinch. http://rutherglen.science.mq.edu.au/wchen/lndmfolder/dm01.pdf Google 'discrete math logic' if you're desperate for more.

>>	Anonymous Sat Apr 23 11:22:57 2011 No.2935826 >>2935805 do chapter 2 http://www.megaupload.com/?d=1WXH71B5

>>	Anonymous Sat Apr 23 11:27:57 2011 No.2935854 File: 164 KB, 480x360, 1302501798858.png [View same] [iqdb] [saucenao] [google] Thanks alot. You really came through.

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