## Thomas' Calculus 13th Edition

Given: $z^2+y^2-4x^2=4$ ...(1) or, $\dfrac{z^2}{(2)^2}+\dfrac{y^2}{(2)^2}-x^2=1$ ...(2) Hence, the equation (2) shows a graph for Hyperboloid of one sheet as shown in graph (i).