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p=15 cm
Ditanya : L permukaan balok
Jawab : p = 15 cm
l= 2/3x 15 = 10 cm
t=4/3 x 15 = 20 cm
L = 2 (pl + pt + lt)
= 2 (15x10 + 15x20 + 10x20)
= 2 (150 + 300 + 200) = 2 x 650 = 1300 cm^2 (B)