Plus butuh banget tolonggjangan ngasal yaathank youu !!!​

Jawaban:

2. 10 cm.

3. (2×p×l)+ (2×p×t)+(2×l×t)

= (2×12×6)+(2×12×8)+(2×6×8)

= 144 + 192+ 96

= 432

Semoga membantu