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Mathematics
Mathematics
Problem
9. Find the area of the triangle with vertices
A
(
1
,
1
,
2
)
,
B
(
2
,
3
,
5
)
\mathrm{A}(1,1,2), \mathrm{B}(2,3,5)
A
(
1
,
1
,
2
)
,
B
(
2
,
3
,
5
)
and
C
(
1
,
5
,
5
)
\mathrm{C}(1,5,5)
C
(
1
,
5
,
5
)
.
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