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Luas trapesium = 1/2 s1 + s2 x t = 200 cm
1/2 x s1 + s2 x 10 = 200 cm
s1 + s2 = 200/5
s1 + s2 = 40
4 x 10 = 40
panjang AB = 3 x 10 = 30 cm
panjang DC = 1 x 10 = 10 cm