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480 = 6x8xt
480 = 48 xt
t = 480/48
t = 10
L sisi balok = 2 x (6x8) + (8x10) + (6 x10)
= 2 x 48 + 80+60
= 2 x188
= 376cm²
luas balok = 2 ( p.l + p.t + l.t )
= 2 ( 6.8 + 6.10 + 8.10 )
= 2 ( 48 + 60 + 80 )
= 2 x 188 = 376 cm
jadi luas balok tersebut adalah 376 cm ²