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MaryJSmith

  • 4 years ago

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

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  1. PaxPolaris
    • 4 years ago
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    First find the length of BD using △BCD

  2. PaxPolaris
    • 4 years ago
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    using Pythagorean theorem

  3. PaxPolaris
    • 4 years ago
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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)\[\implies BD = 6\sqrt{3^2+4^2}=6\sqrt{25}=\Large 30 ft.\]

  4. MaryJSmith
    • 4 years ago
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    Thanks :)

  5. PaxPolaris
    • 4 years ago
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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.

  6. MaryJSmith
    • 4 years ago
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    Do what ?

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

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

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

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

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

  12. PaxPolaris
    • 4 years ago
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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

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

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

  15. MaryJSmith
    • 4 years ago
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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)

  16. MaryJSmith
    • 4 years ago
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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 .

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

  18. PaxPolaris
    • 4 years ago
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    17ish

  19. MaryJSmith
    • 4 years ago
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    17ish ?

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

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

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

  23. PaxPolaris
    • 4 years ago
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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

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

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