Tolong jawab no 15 pakai cara

volume 1/2 bola = 1/2 × 4/3 × pi × r × r × r
= 2/3 × 3,14 × 10 × 10 × 10
= 2093,33 cm3
= 2093 cm3

vol kerucut = 1/3 × pi × r × r × t
= 1/3 × 3,14 × 10 × 10 × 10
= 1046,67 cm3
= 1047 cm3

volume = volume 1/2 bola + volume kerucut
= 2093 + 1047
= 3140 cm3

1cm3 = 2g
3140 cm3 = 3140 × 2
= 6280g

1kg = 1000g
6280g = 6280 : 1000
= 6,28 kg (B)