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Luas = 2 x 3,14 x 5 x 12
Luas = 376,8 cm^2
2. rusuk = a cm
jari-jari = 1/2a cm
Luas Bola = 4 x phi x jari-jari^2
Luas = 4 x 3,14 x (1/2 a)^2
Luas = 12.56 x 1/4 a^2
Luas = 3.14 a^2 cm^2
Luas = phi a^2 cm^2