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Mathematics
Mathematics
Problem
Two points
P
(
x
1
,
y
1
,
z
)
P(x_1,y_1,z)
P
(
x
1
,
y
1
,
z
)
and
Q
(
x
2
,
y
2
,
z
)
Q(x_2,y_2,z)
Q
(
x
2
,
y
2
,
z
)
share the same
z
z
z
–coordinate. What expression gives the distance
P
Q
PQ
P
Q
? Briefly justify why this simplification is valid.
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