tolong di jawab soal no 3

3. Luas permukaan balok =
2 × (p × l) + (p × t) + (l × t)
2 × (10 cm × 4 cm) + (10 cm × 8 cm) + (4 cm × 8 cm)
2 × (40 cm² + 80 cm² + 32 cm²)
2 × 156 cm²
= 312 cm²


Volume balok =
Panjang × lebar × tinggi
10 cm × 4 cm × 8 cm
= 320 cm³



Semoga membantu ^^
Maaf kalau salah

Diket. : p : 10 cm
l : 4 cm
t : 8 cm
Ditanya : a. L per balok.....??
b. Vol balok......??
Jawab. : a. L perm balok : 2.( pl + lt + pt )
= 2.( 10.4 + 4.8 + 10.8 )
= 2.( 40 + 32 + 80)
= 2. 152
= 304
b. Vol balok. :p x l x t
= 10 x 4 x 8
= 40 x 8
= 320