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luas sisi balok adalah:2×14×8+2×8×5+2×14×5=444 cm²
2.128=4(9+16+t)
32=9+16+t
t=32-16-9=7 cm
112 = 14l
l = 8 cm
Luas sisi = 2(pl+pt+lt)
= 2(14x8+14x5+8x5)
= 2 (112+70+40)
= 2 (222)
= 444 cm^2
2.) jml panjang rusuk = 4(p+l+t)
128 = 4(16+9+t)
128 = 4( 25 + t )
128 = 100 + 4t
128 - 100 = 4t
28 = 4t
t = 7cm
semoga membantu:)