Hyperboloid
= Hyperboloid
{title2=$x^2/a^2+y^2/b^2-z^2/c^2=\pm1$}
{wiki}
The displayed surfaces, with positive semiaxes, are hyperboloids. The plus sign gives a <one-sheet hyperboloid>, while the minus sign gives a <two-sheeted hyperboloid>.
= Hyperboloid
{title2=$x^2/a^2+y^2/b^2-z^2/c^2=\pm1$}
{wiki}
The displayed surfaces, with positive semiaxes, are hyperboloids. The plus sign gives a <one-sheet hyperboloid>, while the minus sign gives a <two-sheeted hyperboloid>.