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Mathematics
Problem
Explain in one or two sentences why every point
(
x
,
y
,
z
)
(x,y,z)
(
x
,
y
,
z
)
satisfying
x
2
+
y
2
+
z
2
=
49
x^{2}+y^{2}+z^{2}=49
x
2
+
y
2
+
z
2
=
49
is at the same distance from the origin.
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