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Which of the points ,
, and is closest to the
? Which point lies in the ?
; .
Describe and sketch a surface in represented by the equation .
A vertical plane that intersects the
in the line , .
Find an equation of the sphere with
center and radius . Describe its
intersection with each of the coordinate planes.
circle of radius for , circle of radius
for , and empty set for .
Show that the following equation is
that of a sphere, and find its center and
radius.
Find an equation of the sphere if one
of its diameters has endpoints and .
Describe in words the region of represented by the equation .
A plane parallel to the and
units to the left of it.
Describe in words the region of represented by the inequality .
Write inequalities describing the
solid upper hemisphere of the sphere of radius centered at
the origin.