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estudier

  • 2 years ago

Side length of equilateral triangle? (I have to draw it)

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  1. estudier
    • 2 years ago
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    |dw:1350739907443:dw|

  2. sauravshakya
    • 2 years ago
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    U mean length of BC

  3. estudier
    • 2 years ago
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    yes, ABC is equilateral so any side...

  4. sara12345
    • 2 years ago
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    4/sqrt(3) ?

  5. estudier
    • 2 years ago
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    Sorry, try again...

  6. sara12345
    • 2 years ago
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    4 + 2/sqrt(3)

  7. estudier
    • 2 years ago
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    Um...no.

  8. sara12345
    • 2 years ago
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    |dw:1350740356848:dw|

  9. sara12345
    • 2 years ago
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    |dw:1350740418399:dw|

  10. sara12345
    • 2 years ago
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    |dw:1350740461276:dw|

  11. estudier
    • 2 years ago
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    How u get 30?

  12. estudier
    • 2 years ago
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    Hint - make a transformation

  13. sara12345
    • 2 years ago
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    i wasnt thinkin g sorry.. .let me think

  14. estudier
    • 2 years ago
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    U didn't like my hint?

  15. estudier
    • 2 years ago
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    No!

  16. estudier
    • 2 years ago
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    Imagine that the slant line is the x-axis and shift the triangle "up" 2 so that A is at the origin. Now try it...

  17. sara12345
    • 2 years ago
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    trying

  18. estudier
    • 2 years ago
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    U see what I mean? Now if you drop the perpendiculars from B and C, they will 5 and 4

  19. sara12345
    • 2 years ago
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    dont post any more hints.. plz

  20. estudier
    • 2 years ago
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    |dw:1350742011463:dw|

  21. Kashan
    • 2 years ago
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    4 sqrt 2

  22. estudier
    • 2 years ago
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    Nope, sorry.

  23. estudier
    • 2 years ago
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    I'm getting worried now, I better check my answer... This is Pythagorus and some algebra, right?

  24. sara12345
    • 2 years ago
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    im getting 3 quadratics wid 3 variables

  25. sauravshakya
    • 2 years ago
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    |dw:1350743128666:dw|

  26. sauravshakya
    • 2 years ago
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    I guess Now, using cosine rule and sine rule will give x and y.

  27. estudier
    • 2 years ago
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    |dw:1350743084775:dw|

  28. sauravshakya
    • 2 years ago
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    is it 6.4291 ?

  29. estudier
    • 2 years ago
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    I have 2 sqrt 7

  30. estudier
    • 2 years ago
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    First 2 equations give s^2-t^2 = 9 Second and third give s^2 -2st =24 t = (s^2-24)/2s substitute in s^2-t^2 gives a quadratic in s etc.

  31. estudier
    • 2 years ago
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    I think Sara was closest...

  32. sauravshakya
    • 2 years ago
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    2 Attachments
  33. sauravshakya
    • 2 years ago
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    Where did I go wrong???

  34. estudier
    • 2 years ago
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    I will have a look later on.....

  35. sauravshakya
    • 2 years ago
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    okay!

  36. sauravshakya
    • 2 years ago
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    Thanx @shubhamsrg AND yes there was a mistake in cosine law. Now, that gives the length 5.2915

  37. sauravshakya
    • 2 years ago
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    Which looks correct.

  38. shubhamsrg
    • 2 years ago
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    you did all the work buddy,, as i said,,a human error..i do more mistakes than that in my work.,, anyways,,good job YET AGAIN>>

  39. estudier
    • 2 years ago
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    Ah, u found it, good:-)

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