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Mathematics
Problem
A student obtains the value of
x
1
(
y
2
−
y
3
)
+
x
2
(
y
3
−
y
1
)
+
x
3
(
y
1
−
y
2
)
x_1(y_2-y_3)+x_2(y_3-y_1)+x_3(y_1-y_2)
x
1
(
y
2
−
y
3
)
+
x
2
(
y
3
−
y
1
)
+
x
3
(
y
1
−
y
2
)
for a triangle as
−
18
-18
−
18
. What does the negative sign indicate, and what is the actual area of the triangle?
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