Suatu balok memiliki luas permukaan 198 cm2. Jika lebar dan tinggi balok masing 6 cm dan 3 cm, tentukan panjang balok tersebut

p = ?
l = 6 cm
t = 3 cm
L = 198 cm2

L = 2 ( pl + lt + pt)
198 = 2 ( p × 6 + 6 × 3 + p × 3)
198 = 2 ( 6p + 18 + 3p)
198 = 12p + 36 + 6p
198 - 36 = 12p + 6p
162 = 18p
18p = 162
p = 162/18
p = kamu bagi aja sndri

l = 6 cm
t = 3 cm

Luas permukaan balok = 2(pl + pt +lt)
198 = 2((p × 6) + (p × 3) + (6 × 3))
198 = 2(6p + 3p + 18)
198 = 12p + 6p + 36
198 = 18p + 36
18p = 198 - 36
18p = 162
p = 162/18
p = 9 cm