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Kelas 8 MatematikaBab Bangun Ruang
Luas jaring-jaring balok = 484
luas permukaan balok = 484
2 . (p . l + p . t + l . t) = 484
p . l + p . t + l . t = 484/2
p . l + p . t + l. t = 242
Misal,
l = 4 cm dan t = 2 cm
p . l + p . t + l . t = 242
p . 4 + p . 2 + 4 . 2 = 242
4p + 2p = 242 - 8
6p = 234
p = 234/6
p = 39 cm
Jadi, salah satu yang valid adalah p = 39 cm, l = 4 cm dan t = 2 cm