Alas sebuah prisma tegak berbentuk trapesium, panjang sisi sejajar 16 cm dan 12 cm, tinggi trapesium 10 cm. Bila tinggi prisma 18 cm, maka hitunglah luas permukaan prisma tersebut!
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= 280
L1 = 16 x 18 = 288
L2 = 10 x 18 = 180
L3 = 12 x 18 = 216
L4 = x 18 = 18 = 36
L total = ( 280 + 288 + 180 + 216 + 36 )
= 1000 + 36