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Lp = Luas permukaan
La = Luas alas
Lt = Luas sisi tegak
La = s²
Lt = st
Lp = 2La+4Lt
864 = 2La+4Lt
2La+4Lt = 864
2s²+4st = 864
2s²+48s = 864
s²+24s = 432
s = 12