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nyari t limas dulu
1296 = 1/3 x 18 x 18 x t
12 cm = t
tinggi sisi tegak = √12²+9² = √144+81 = √225 = 15 cm
L permukaan = L als + 4 x L sisi tegak
= (18 x 18) + 4 x (1/2 x 18 x 15)
= 324 + 4 x 135
= 324 + 440
= 764 cm^2