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Mathematics
Mathematics
Problem
Prove by using distance formula that the points
P
(
1
,
2
,
3
)
P(1, 2, 3)
P
(
1
,
2
,
3
)
,
Q
(
−
1
,
−
1
,
−
1
)
Q(-1, -1, -1)
Q
(
−
1
,
−
1
,
−
1
)
and
R
(
3
,
5
,
7
)
R(3, 5, 7)
R
(
3
,
5
,
7
)
are collinear.
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