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

it is not the edge that is given but the ALTITUDE..

now i got it.. :))

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How ?

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

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

Sorry..\[\large\color{green}{x=\frac{10}{\sqrt{3}}}\]

that's fine.. ^^

;)

I didn't help.. o.O

well, you tried helping me.. so thanks :))

if u got the same volume, then u are correct.

It's nearly 181.4 :(

then incorrect :P

:D

:D

OHH Anyway thnks for U all and Welcome...

yes

I thought it was the altitude of a triangle.. :P

no.. it's the height of the tetrahedron

Ok got it.. :) Then your way is correct. :D

yep :D

what is the figure and where did 2/3 came from?

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