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One equation to rule them all solution in Clear category for Area of a Convex Polygon by Vulwsztyn
def checkio(data):
data.append(data[0])
y=0
for i in range(len(data)-1):
y+=data[i][0]*data[i+1][1]-data[i][1]*data[i+1][0]
y=abs(y/2)
return(y)
Oct. 22, 2016