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376= 2 ( 10×8 + 8×t + 10×t)
376 = 160 + 16t + 20t
36 t= 216
t= 6 cm
volume balok= p× l× t= 10 × 8 ×6= 480 cm³
⇒ 2(pl + pt + lt) = 376
⇒ pl + pt + lt = 188
⇒ (10)(8) + (10)(t) + (8)(t) = 188
⇒ 80 + 10t + 8t = 188
⇒ 18t = 108
⇒ t = 108/18
⇒ t = 6 cm
maka
V = p · l t
= 10 · 8 · 6
= 480 cm³
Terimakasih semoga membantu