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rumus = luas alas + luas sisi samping
maka :
t sisi tegak = akar dr 20² + 15²
= akar dr 400 + 225
= √625
= 25 cm
jadi, Lp limas = L alas + jumlah L sisi tegak
= s² + 4.1/2.a.t
= 40² + 4.1/2.40.25
= 1600 + 2000
= 3600 cm² (B)