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x² + y² - 6y ≤ 0
(x-0)² + ( y -3)² - 9 ≤ 0
(x -0)² + (y - 3)² ≤ 9
(x -0)² + (y -3)² ≤ 3²
Jest to koło o promieniu
r = 3
P = π r² = π * 3² = 9 π