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480 = 2 · 3,14 · 3x (3x + 5x)
480 = 6,28 · 3x (8x)
480 ÷ 6,28 = 24x²
76,43 = 24x²
x² = 76,43 ÷ 24
x² = 3,18
x = √3,18
x = 1,78
jadi, panjang jari jari = 3x = 3 (1,78) = 5,35 cm