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luisz

  • 2 years ago

what is the perimeter of triangle ABC?

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  1. pitankar
    • 2 years ago
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    sum of the three side's length.

  2. luisz
    • 2 years ago
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    |dw:1347812022332:dw|

  3. luisz
    • 2 years ago
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    tips?

  4. hartnn
    • 2 years ago
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    there is a 30-60-90 triangle, u know the property of this special triangle ??

  5. luisz
    • 2 years ago
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    yes

  6. luisz
    • 2 years ago
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    but I know none of the sides

  7. luisz
    • 2 years ago
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    And I do not know the angles for the other triangle with sides

  8. luisz
    • 2 years ago
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    I could assume that triangle ABC is a 30-60-90, right?

  9. luisz
    • 2 years ago
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    C=30 degrees

  10. luisz
    • 2 years ago
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    A=60 degrees

  11. luisz
    • 2 years ago
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    B=90 degrees?

  12. pitankar
    • 2 years ago
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    calculate the length of perpendicular from A to BC using Pythagoras theorem. then use trigonometry relations to calculate AC. rest you can get...

  13. hartnn
    • 2 years ago
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    use pythagoras theorem to find the side...\|dw:1347812215548:dw|

  14. luisz
    • 2 years ago
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    ahh

  15. luisz
    • 2 years ago
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    good ol' pythagorean theorem

  16. luisz
    • 2 years ago
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    so we have a 9-12-15 right triangle

  17. luisz
    • 2 years ago
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    3-4-5?

  18. luisz
    • 2 years ago
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    so the altitude becomes 12

  19. hartnn
    • 2 years ago
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    now AD = 12 can u find all sides ?

  20. luisz
    • 2 years ago
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    30 degree side becomes 12 radical 3

  21. luisz
    • 2 years ago
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    AC equals 24

  22. luisz
    • 2 years ago
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    now

  23. luisz
    • 2 years ago
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    15+24=39

  24. hartnn
    • 2 years ago
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    use pythagoras

  25. luisz
    • 2 years ago
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    39+9=48

  26. luisz
    • 2 years ago
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    48+12 radical 3?

  27. luisz
    • 2 years ago
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    is that really it?

  28. luisz
    • 2 years ago
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    No wonder this problem was so hard

  29. luisz
    • 2 years ago
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    I never used pythagorean theorem

  30. luisz
    • 2 years ago
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    derp

  31. hartnn
    • 2 years ago
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    u did this by yourself :)

  32. chihiroasleaf
    • 2 years ago
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    you have lots of geometry problem @luisz :p

  33. luisz
    • 2 years ago
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    ty

  34. luisz
    • 2 years ago
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    I know

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