Regular tetrahedron/Introductory problem

Revision as of 20:30, 30 December 2012 by N1000 (talk | contribs) (Solution)
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Find the volume of a tetrahedron whose sides all have length $2$.


We find the area of the base:

$\mathrm {A} =\dfrac{4\sqrt{3}}{4}=\sqrt{3}$

Now we find the lateral height:

$\mathrm {lh}=\sqrt{2^2-1^2}=\sqrt{3}$

Now we can find the height of the tetrahedron:

$\mathrm {h}=\sqrt{(\sqrt{3})^2-(\dfrac{1}{3}*\sqrt{3})^2}=\sqrt{\dfrac{8}{3}$ (Error compiling LaTeX. )

Now the volume of the tetrahedron is:


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