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r=1/2 diameter
karena anganya gak ada yang kelipatan 7 maka gunakan phi 3,14
1. r = 47
Luas lingkaran = 3,14 x 47 x 47 = 6.936,26 cm²
2. r = 58
Luas lingkaran = 3,14 x 58 x 58 = 10.562,96 cm²
3. r = 65
Luas lingkaran = 3,14 x 65 x 65 = 13.266,5 cm²
Semoga jawaban cukup membantu .. boleh dong minta bintangnya ? :)