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= PL + 2(LT) + 2(PT)
= (20)(6) + 2(6)(11) + 2(20)(11)
= 120 + 132 + 440
= 692 cm²
p = 20 cm
l = 6 cm
t = 11 cm
Dijawab :
L.Permukaan tanpa tutup = (p . l) +2(l . t) +2(p . t)
= (20 . 6) +2(6 . 11) +2(20 . 11)
= 120 +2(66) +2(220)
= 120 +132 +440
= 692 cm²