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s = ∛125
= 5
kragka kubus
krangka = 12 x s
= 12 x 5
= 60 cm
pajag balok
kragka = 4 (p+l+t)
60 = 4( 7 + 5 + t)
60 = 4 ( 12 + t)
60 = 48 + 4t
60 -48 = 4t
12 = 4t
12/4 = t
3 = t
luas permukaa balok
Lp = 2 (pxl + pxt + lxt)
= 2 (7x5 + 7x3 + 5x3)
= 2 ( 35 + 21 + 15)
= 2 ( 71 )
= 142 cm²
jawabnya 142 cm²