ComputeArea
  
  
    CoordinatedGeometry
  
  
    AMC10/12
  
  
    Basic
  
  2009
  
  Triangle $ABC$ has vertices $A = (3,0)$, $B = (0,3)$, and $C$, where $C$ is on the line $x + y = 7$. What is the area of $\triangle ABC$?
 
    
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