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Can anyone explain why I was incorrect in this problem: enter image description here

I used a tetrahedron solver online, http://rechneronline.de/pi/tetrahedron.php, and it says I have the right answer.

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  • $\begingroup$ Note that $\sqrt 2$ and $\sqrt 3$ are very different things... $\endgroup$ May 30, 2013 at 4:41
  • $\begingroup$ yes and online if I look up the equation it shows a $\sqrt 2$ $\endgroup$
    – keji
    May 30, 2013 at 4:47
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    $\begingroup$ Don't trust everything you read online... $\endgroup$
    – Zen
    May 30, 2013 at 4:47
  • $\begingroup$ Ok so does the real equation have a $\sqrt 3$ $\endgroup$
    – keji
    May 30, 2013 at 4:50

2 Answers 2

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Assuming that $S$ denotes the length of a side, your answer is correct. See here.

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  • $\begingroup$ Ok thanks. Just trying to prepare for this next test $\endgroup$
    – keji
    May 30, 2013 at 4:56
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Assuming that $S$ (or is it $S'$?) indicates side length and not surface area, you're correct.

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