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Mathematics
Mathematics
Problem
State the determinant expression that gives twice the area of a triangle whose vertices are
(
x
1
,
y
1
)
(x_1,y_1)
(
x
1
,
y
1
)
,
(
x
2
,
y
2
)
(x_2,y_2)
(
x
2
,
y
2
)
and
(
x
3
,
y
3
)
(x_3,y_3)
(
x
3
,
y
3
)
.
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