Find the volume of a regular tetrahedron with side length a=1a=1a=1.
fracsqrt212\\frac{\\sqrt{2}}{12}fracsqrt212
fracsqrt312\\frac{\\sqrt{3}}{12}fracsqrt312
frac16\\frac{1}{6}frac16
fracsqrt26\\frac{\\sqrt{2}}{6}fracsqrt26