The following produces 9/2 without needing to use simplify. :D
def area(A, B, C):
"""
A, B & C are objects with x and y attributes
:return: area of the trigon
"""
x1 = B.x - A.x
y1 = B.y - A.y
x2 = C.x - A.x
y2 = C.y - A.y
return (x1*y2 - x2*y1) / 2
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