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cara = 80 x 2 : 10 = 16
L = 1/2 x d1 x d2
80 = 1/2 x 10 x d2
80 x 2 = 2 x 1/2 x 10 x d2
160 = 10 x d2
160 : 10 = 10 : 10 x d2
16 cm = d2