Multiple Choice
Describe the 3-space graph of the equation x2 + z2 = 4.
A) a circle of radius 2 in the xz-plane having centre at the origin
B) a circular cylinder of radius 2 with central axis along the y-axis
C) a sphere of radius 2 having centre at the origin
D) a disk of radius 2 in the xz-plane having centre at the origin.
E) a circular cylinder of radius 4 with central axis along the x-axis
Correct Answer:

Verified
Correct Answer:
Verified
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