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MaryJSmith

The remedy is experience.. And I don't have any.. Help please ?

  • 2 years ago
  • 2 years ago

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  1. PaxPolaris
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    First find the length of BD using △BCD

    • 2 years ago
  2. PaxPolaris
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    using Pythagorean theorem

    • 2 years ago
  3. PaxPolaris
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    \[BD^2=18^2+24^2\]\[\therefore BD=\sqrt{18^2+24^2}\] (you can remove the common factor of 18 and 24 out to make the math easier)\[\implies BD = 6\sqrt{3^2+4^2}=6\sqrt{25}=\Large 30 ft.\]

    • 2 years ago
  4. MaryJSmith
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    Thanks :)

    • 2 years ago
  5. PaxPolaris
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    Then to find AD you need to know trigonometry ....OR at-least the ratios of the sides of 30-60-90 triangles.

    • 2 years ago
  6. MaryJSmith
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    Do what ?

    • 2 years ago
  7. PaxPolaris
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    |dw:1333147962445:dw| In 30-60-90 triangles the ratios of the sides is always \[\Large 1:\sqrt3:2\]

    • 2 years ago
  8. MaryJSmith
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    Cool... Now what do I do with that ?

    • 2 years ago
  9. PaxPolaris
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    △ABD is a 30-60-90 triangle.... if you know one side(BD) you can find the others

    • 2 years ago
  10. MaryJSmith
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    so do i do 30*the sqr rt of 3 ?

    • 2 years ago
  11. MaryJSmith
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    That would be 52 (rounded up)

    • 2 years ago
  12. PaxPolaris
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    AD is smaller than BD... ...If the side opposite the 30deg (smallest) angle is length 1(smallest side) ..........then the side opposite the 60deg angle is sqrt3

    • 2 years ago
  13. MaryJSmith
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    I'm confused again..

    • 2 years ago
  14. PaxPolaris
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    \[\Large {BD \over AD} = \frac {\sqrt3} 1\]

    • 2 years ago
  15. MaryJSmith
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    so would you do 30*the square root of 3 divided by 2 then ? That comes out to be 26 (rounded up)

    • 2 years ago
  16. MaryJSmith
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    Dude , I'm so confused . Can you just give me the answer ? Lol . I'll ask my teacher about all this crap on Monday .

    • 2 years ago
  17. PaxPolaris
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    \[{ 30 \over AD} = {\sqrt3 \over 1}\] \[AD = {30 \over \sqrt 3} = \Large 10\sqrt3\ ft.\]

    • 2 years ago
  18. PaxPolaris
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    17ish

    • 2 years ago
  19. MaryJSmith
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    17ish ?

    • 2 years ago
  20. AsianDuck
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    17.3 (3sf)

    • 2 years ago
  21. MaryJSmith
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    thanks (what does 3sf mean ?)

    • 2 years ago
  22. AsianDuck
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    3 significant figures (1, 7 and 3)

    • 2 years ago
  23. PaxPolaris
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    ignore significant figures if you don't know what it means... by seventeen-ish, I meant 10*sqrt3 is around 17

    • 2 years ago
  24. AsianDuck
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    ok. 17.3 (1dp / 1 decimal point)

    • 2 years ago
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