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Loser66

  • one year ago

Is it true that all triangles are isoceles? If you think this is a trivial question, explain the hidden assumption in the proof that all triangles are isoceles. Please, help

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  1. Loser66
    • one year ago
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    @dan815 What do they want me to do?

  2. dan815
    • one year ago
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    no not all triangles are isocles

  3. Loser66
    • one year ago
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    dan!! of course.

  4. dan815
    • one year ago
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    lol

  5. Loser66
    • one year ago
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    but I don't understand the rest of the question.

  6. dan815
    • one year ago
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    to show that not all triangles are isocles, pick 3 non equal angles that sum to 180, and prove that a different angle has a different side

  7. Loser66
    • one year ago
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    a right triangle is a perfect proof, right?

  8. Loser66
    • one year ago
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    So, If I say: No, not all triangles are isoceles, and give out the proof, I don't have to do the rest of it, right?

  9. anonymous
    • one year ago
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    dan

  10. Loser66
    • one year ago
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    ???

  11. anonymous
    • one year ago
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    @Loser66 this is not trivial question. it has geometrical attempt

  12. anonymous
    • one year ago
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    This fallacy has been attributed to Lewis Carroll znd explained by maxwell .

  13. anonymous
    • one year ago
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    https://en.wikipedia.org/wiki/Mathematical_fallacy#Fallacy_of_the_isosceles_triangle

  14. anonymous
    • one year ago
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    if you need any help understanding the proof and the fault in it im always here :P

  15. Loser66
    • one year ago
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    hey, ikram. What should I do for this question? find out the fallacy?

  16. Loser66
    • one year ago
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    Since this proof is not on my book, and I am not allowed to use the internet solution, how can I prove it is a fallacy?

  17. anonymous
    • one year ago
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    yes, just mention their used to be a known proof by Lewis Carroll , which says " every triangle is isosceles ", mention the proof and then say why its wrong.

  18. Loser66
    • one year ago
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    ok, Thanks a ton. Let me try. :)

  19. anonymous
    • one year ago
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    in this case its okay if used Internet as reference since this is history and not work like its wrong proof anyway lol

  20. anonymous
    • one year ago
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    you are welcome @Loser66 :) PS:- saying every triangle is isosceles s not weird at all, even if you see some triangles do not match, one of eclids postulate said "all right triangles are congruent" and have a proof for it even thought for first look it does not seems alright, okay now ?

  21. anonymous
    • one year ago
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    you also can disprove the main question in addition of mention history about it :D

  22. Loser66
    • one year ago
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    I figure out the mistake on the proof. Correct me if I am wrong, please at 6, the case to get 2 triangles are equal is ASA, not AAS, right?

  23. Loser66
    • one year ago
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    It means the side must be between the angles.

  24. anonymous
    • one year ago
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    nope, the mistake is in step 3

  25. anonymous
    • one year ago
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    Let these two lines meet at a point O., there is no guaranty that O would be inside the triangle not on circumcircle or out of it.

  26. anonymous
    • one year ago
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    in general thes line meet in this conditional at point O in circumcircle, there is only one case that it would be inside the triangle which is isosceles and equilateral triangles

  27. Loser66
    • one year ago
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    oh, I see!! man!!

  28. anonymous
    • one year ago
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    :D

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