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Mathematics
Mathematics
Problem
Points
P
(
1
,
−
2
,
3
)
P(1, -2, 3)
P
(
1
,
−
2
,
3
)
,
Q
(
5
,
1
,
3
)
Q(5, 1, 3)
Q
(
5
,
1
,
3
)
and
R
(
−
2
,
4
,
3
)
R(-2, 4, 3)
R
(
−
2
,
4
,
3
)
lie in the same horizontal plane. Which of the segments
P
Q
PQ
P
Q
,
Q
R
QR
QR
or
P
R
PR
P
R
is the longest? Give its length.
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