kak tolong di bantu ya? 1-5 ajha (beserta caranya)

1.
Volume :
V = πr²t
V = 3,14 × 12 × 12 × 18
V = 37,68 × 216
V = 8.138,88 m³

2.
Volume :
V = πr²t
V = 3,14 × 8 × 8 × 16
V = 3,14 × 64 × 16
V = 3,14 × 1.024
V = 3.215,36 m³

3.
Jari - Jari :
L = πr²
154 = 22/7r²
49 = r²
r² = 49
r = 7 cm

Volume :
V = πr²t
V = 22/7 × 7 × 7 × 24
V = 22 × 168
V = 3.696 cm³

4.
Volume :
V = πr²t
V = 22/7 × 35 × 35 × 35
V = 22 × 5 × 1.225
V = 110 × 1.225
V = 134.750 cm³

5.
Jari - Jari = ½ × D = ½ × 16 cm = 8 cm

Volume :
V = πr²t
V = 3,14 × 8 × 8 × 16
V = 3,14 × 64 × 16
V = 3,14 × 1.024
V = 3.215,36 cm³

Maaf Kalau Salah