# Chapter 12: Vectors and the Geometry of Space - Section 12.6 - Cylinders and Quadric Surfaces - Exercises 12.6 - Page 732: 25

Elliptical (circular) cone.

#### Work Step by Step

Comparing to Table 12.1, the equation is of the form $\displaystyle \frac{x^{2}}{1^{2}}+\frac{y^{2}}{1^{2}}=\frac{z^{2}}{1}$ this is an elliptical cone, in which the traces in planes parallel to the xy plane ( $z=k$) are circles of radius $k$.

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