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1.296 = 1/3 × (18×18) × t
1.296 = 108t
1.296/108 = t
12 = t
L = L.sisi tegak seluruhnya + L.alas
t sisi tegak = √12² + 9² = √225 = 15
= (4×1/2×18×15) + 324
= 540 + 324
= 864 cm²