nomor 19 dong + caranya

MAPEL = MATEMATIKA
KELAS = 9
BAB = BRSL

diketahui =
- diamater = 7cm
- panjang balok = 3 × 7 = 21cm
- lebar balok = 7cm
- tinggi balok = 7cm

ditanya =
- V. udara diluar bola & didalam balok?

V. 3 bola = 3×⅛×4/3πd³
= 3 × ⅛ × 4/3 × 22/7 × 7 × 7 × 7
= ⅛ × 4 × 22/7 × 7 × 7 × 7
= ½ × 22/7 × 7 × 7 × 7
= 11 × 49
= 539cm³

V. balok = plt
= 21 × 7 × 7
= 1029cm³

V. udara = V. balok - V.3bola
= 1029 - 539
= 490cm³

semoga membantu