Tentukan pusat dan jari-jari Lingkaran berikut : 1. x² + y² + 8x - 9 = 0 2. x² + y² - 12y + 11 = 0 3. x² + y² + 2ax + 6ay - 6a² = 0 Tolong bantu ngerjain kalo

1.
x² + 8x + y² = 9
(x + 4)² + y² = 9 + 16
>>> P(-4,0)
>>> r = √25 = 5

2.
x² + y² - 12y = -11
x² + (y - 6)² = -11 + 36
>>> P(0,6)
>>> r = √26

3.
x² + 2ax + y² + 6ay = 6a²
(x + a)² + (y + 3a)² = 6a² + a² + 9a²
>>> P(-a,-3a)
>>> r = √(16a²) = 4a