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SR = 12
tinggi trapesium kecil /15 = 18/30
tinggi trapesium kecil = 9
L trapesium besar - L trapesium kecil
(20+30)15/2 + (12+18)9/2
375 -135 = 240 m² = 2400000 cm²
luas keramik = 20x10 = 200 cm²
keramik yg dibutuhkan = 2400000 :200 = 12000