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KL = 10 cm
LM = 18 cm
Ot = 12 cm
maka :
Luas alas = p x l
= 10 x 18 = 180 cm²
K alas = 2 x (p+l)
= 2 x (10+18)
= 2 x 28
= 56
Luas Permukaan = L Alas + 1/2 K alas x t
= 180 + (1/2 x 56) x 12
= 180 + 336
= 516 cm²