Describe the surface whose equation in cylindrical coordinates is $\phi = \pi$ .
A)Cylinder with vertical axis
B)Cylinder with horizontal axis
C)Sphere
D)Positive z-axis
E)Negative z-axis
F)Paraboloid
G)Cone or half-cone with vertical axis
H)Cone or half-cone with horizontal axis

Question

Quizplus · Accepted Answer

The equation $\phi = \pi$ in cylindrical coordinates represents the negative z-axis, as $\phi$ is the angle measured from the positive x-axis in the xy-plane, and $\phi = \pi$ points directly in the negative z-direction.

Describe the Surface Whose Equation in Cylindrical Coordinates Is ϕ=π\phi = \piϕ=π

Describe the Surface Whose Equation in Cylindrical Coordinates Is $\phi = \pi$