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benda 1 yang tegak dekat sumbu y
benda 2 yang mendatar dekat sumbu x
x1 , y1 = (0 + 20)/2 , (0 + 80)/2 = 10 , 40
A1 = 20 x 80 = 1600
x2 , y2 = (20 + 60)/2 , (0 + 20)/2 = 40 , 10
A2 = 40 x 20 = 800
z ( 20 , 30)