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2
= 30 x 6
2
= 90 cm2
panjang sisi miring = √6^2 + 6^2 = 6√2
K.alas = 18 + 12 + 6 + 6√2 = 36 + 6√2
Lpermukaan prisma= (2 x Lalas) + (Kalas x Tp)
= (2x90) + (36 + 6√2 x 9)
= 180 + 324 + 54√2 = 504 + 54√2 cm2