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eroshea

Find the volume of a regular tetrahedron whose altitude measures 10 cm.

  • one year ago
  • one year ago

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  1. hartnn
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    the formula is V = \(\sqrt 2\)/12 * a^3

    • one year ago
  2. eroshea
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    it is not the edge that is given but the ALTITUDE..

    • one year ago
  3. eroshea
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    now i got it.. :))

    • one year ago
  4. Miyuru
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    How ?

    • one year ago
  5. eroshea
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    altitude = root(2/3) * a 10 = root(2/3) * a 100=2/3 a^2 a= 5 root 6 V = root(2)/12 * a^3 V = 216.5

    • one year ago
  6. Miyuru
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    I thought it like this..\[\large\color{green}{x=\frac{100}{\sqrt{3}}}\] |dw:1353600894733:dw|

    • one year ago
  7. Miyuru
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    Sorry..\[\large\color{green}{x=\frac{10}{\sqrt{3}}}\]

    • one year ago
  8. eroshea
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    that's fine.. ^^

    • one year ago
  9. Miyuru
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    ;)

    • one year ago
  10. Miyuru
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    @eroshea I am glad tht u got it..:D :)

    • one year ago
  11. eroshea
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    thanks for your help @hartnn and @Miyuru ^^

    • one year ago
  12. Miyuru
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    I didn't help.. o.O

    • one year ago
  13. Miyuru
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    Thank @hartnn ONLY

    • one year ago
  14. eroshea
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    well, you tried helping me.. so thanks :))

    • one year ago
  15. hartnn
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    u got it on your own, @eroshea :)

    • one year ago
  16. Miyuru
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    Is my way wrong @hartnn

    • one year ago
  17. hartnn
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    if u got the same volume, then u are correct.

    • one year ago
  18. Miyuru
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    It's nearly 181.4 :(

    • one year ago
  19. hartnn
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    then incorrect :P

    • one year ago
  20. Miyuru
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    :D

    • one year ago
  21. eroshea
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    :D

    • one year ago
  22. Miyuru
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    OHH Anyway thnks for U all and Welcome...

    • one year ago
  23. Miyuru
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    Ohh @eroshea you mean the height is 10.. Isn't it ?

    • one year ago
  24. eroshea
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    yes

    • one year ago
  25. Miyuru
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    I thought it was the altitude of a triangle.. :P

    • one year ago
  26. eroshea
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    no.. it's the height of the tetrahedron

    • one year ago
  27. Miyuru
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    Ok got it.. :) Then your way is correct. :D

    • one year ago
  28. eroshea
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    yep :D

    • one year ago
  29. kneenutskii
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    what is the figure and where did 2/3 came from?

    • 11 months ago
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