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1296 = 1/3.s.s.12
1296 = s² . 4
s² = 1296/4
s² = 324
s = 18 cm
tinggi sisi tegak = p
p² = 12²+9²
p² = 144+81
p² = 225
p = √225
p = 15 cm
L = luas alas + 4.luas sisi tegak
= 324 + 4.18.15/2
= 324 + 540
= 864 cm²