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Jari" bola kecil (rk) = 4 cm
Jari" bola besar (rb) = 6 cm
Jwab:
Lk : Lb
= 4πrk² : 4πrb²
coret: 4π
= rk² : rb²
= 4² : 6²
= 16 : 36
= 4 : 9
Salam......... ^^