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In mathematics, a hyperboloid is a quadric, a type of surface in three dimensions, described by the equation:
| <math>{x^2 \over a^2} + {y^2 \over b^2} - {z^2 \over c^2}=1</math> | | (hyperboloid of one sheet), |
or
| <math>{x^2 \over a^2} + {y^2 \over b^2} - {z^2 \over c^2}=-1</math> | | (hyperboloid of two sheets). |
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