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180 = 5x . 3x . 2x
180 = 30x
x = 6
p= 5x
= 5 . 6
= 30cm
l = 3x
= 3.6
= 18cm
t = 2x
= 2.6
=12cm
L prmukaan balok = 2(p . l) + 2(p . t) + 2(l . t)
= 2(30cm . 18cm) + 2(30cm . 12cm) + 2(18cm . 12cm)
= 540cm² + 360cm² + 216cm²
= 1.116cm²
smoga mmbntu :)