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The Area of a Triangle Using a Determinant

A =
1
2
-7.21
-5.31
1
4.12
0.23
1
-2.27
2.85
1
= 32.5426
The area of a triangle with vertices at the coordinates
(a,b)
,
(c,d)
, and
(e,f)
is the absolute value of
A=
1
2
a
b
1
c
d
1
e
f
1
.
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