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Mathematics
Mathematics
Problem
If the area of the triangle whose vertices are
A
(
−
1
,
1
,
2
)
A(-1, 1, 2)
A
(
−
1
,
1
,
2
)
;
B
(
1
,
2
,
3
)
B(1, 2, 3)
B
(
1
,
2
,
3
)
and
C
(
t
,
1
,
1
)
C(t, 1, 1)
C
(
t
,
1
,
1
)
is minimum, then the absolute value of parameter
t
t
t
is
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