Jawaban:

Penjelasan dengan langkah-langkah:

1. Volume tabung = πr².t

V = πr².t

π = 22/7 atau 3,

d = 21 cm , r = d/2 = 21/2 = 10,5 cm

Volume = 9702 cm³

maka,

V = πr².t

9702 = 22/7.(10,5)². t

9702 = 22/7. (110.25).t

9702 = (22 × 110.25) /7 . t

9702 = (24,255)/7 . t

t = 9702 ÷ (24,255/7)

t = 9702× 7 / 24,255

t = 67,914 / 24,255

t = 2,8 cm

2. Volume tabung = 3465 liter

tinggi = 1 m = 10 dm

V = πr²t

3465 = 22/7 . r² . 10

r² = 3465 ÷ ( 22/7 × 10)

r² = 3465 ÷ 220/ 7

r² = 3465 × 7 / 220

r² = 110,25

r = √110,25

r= 10,5 dm = 1,05 m