8.
1)
x² + y² =6
2)
(x-1)² + (y-2)² = (2-2)² + (4-1)² = 9
x²- 2x +1 + y² - 4y + 4 = 9
x²-2x+y²-4y - 4 = 0
3)
(x+3)² + (y-5)² = (5-1)² + (8-(-3))² = 4²+11² = 129
x²+6x+y²-10*y - 100 =0
4)
(x+13)² + (y-π)² = (2-(-13))² = 225
x²+26x+ 169 +y² - 2π + π² - 56 = 0
5)
(x-9)² + *(y-10)² = (9-(-7))²+(10-3)² = 16²+7²= 305
x²-18x+y²-20y-124 = 0