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= 6 dm
L tutup = x 3 x 4
= 6 dm
L sisi = (3 x 13) + (4 x 13) + (5 x 13)
= 39 + 52 + 65
= 156 dm
L permukaan = L alas + L tutup + L sisi
= 6 + 6 + 156
= 168 dm
12+39+52+65(sisi alas kali tinggi)
=181