diameter= 20 dm jari-jari= ... phi= 3,14 volume bola= ...

Mapel : Matematika
Bab : Bangun Ruang Sisi Lengkung

d = 20 dm

r = 1/2 x d
  = 1/2 x 20 dm
  = 10 dm

Volume bola
= 4/3 x π x r³
= 4/3 x 3,14 x 10 dm x 10 dm x 10 dm
= 4/3 x 3.140 dm³
= 4.186,67 dm³