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1/2 dari 12 = 6cm, maka:
t.bidang tegak = akar dr 6²+8²
= akar dr 36+64
= √100
= 10 cm
jadi, Lp.limas = L alas + jumlah L sisi tegak
= s² + 4.1/2.a.t
= 144 + 4.1/2.12.10
= 144 + 240
= 384 cm²