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b) Jumlah luas sisi tegak + Luas alas
(10 X 12 : 2 X 4) + (12 X 12)
(60 X 4) + 144 = 240 + 144 = 384 cm
a. t limas = akar dr 10²-6²
= akar dr 100-36
= √ 64 = 8 cm
b. Lp limas = L alas + jumlah L bidang tegak
= s² + 4.1/2.a.t
= 12² + 4.1/2.12.10
= 144 + 240 = 384 cm²