Coordinates

A quadrilateral has four points A(0,1), B(1,-3), C(5,-2) and D(4,0) as coordinates What is the area of quadrilateral ABCD?

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$A_{ABCD}=◻5\times 3+◿\ 4\times1/2- ◺\ 4\times1/2-◿\ 4\times1/2-◹\ 2\times 1/2$

$A_{ABCD}=15+2-2-2-1$

$A_{ABCD}=12$

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