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Verified answer
Kelas 11 MatematikaBab Persamaan Lingkaran
x² + y² + 6x - 2y + 1 = 0
x² + 6x + y² - 2y = -1
(x + 3)² + (y - 1)² = 3² + 1² - 1
(x + 3)² + (y - 1)² = 3²
r² = 3²
r = 3
Maka, jari-jarinya adalah 3