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1296 = 1/3.s².12
1296 = 4.s²
1296 : 4 = s²
324 = s² -----> s = √324 = 18 cm
1/2 dari 18 = 9 cm,maka:
t.bidang tegak = akar dr 9²+12²
= akar dr 81+144
= √225
= 15 cm
jadi, Lp.limas = L alas + jumlah L sisi tegak
= s² + 4.1/2.a.t
= 18² + 4.1/2.18.15
= 324 +540
= 864 cm²