+434 In the diagram, the four points have coordinates $A(0,1)$, $B(1,3)$, $C(5,2)$, and $D(4.5,0)$. What is the area of quadrilateral $ABCD$?
+2 stop posting your AoPs Intro to Counting and Probability class with Charles Buehrle week 2 homework. just use the message board or do it yourself. its not that hard
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