GRE Problem Solving Question 386
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Source: Magoosh
Point A in the x*y-coordinate system is shown below. Given two other points B (4a, b) and C (2a, 5b), what is the area of triangle ABC in terms of a and b? 
-  A 

 -  B 

 -  C 

 - D 4*a*b
 - E 6*a*b
 
