Question

Determine the center and radius of the following circle equation:

x2 + y2 – 16x + 10y + 80 = 0?

Answer 1

centre is (8, -5)

`r = \sqrt{ {g}^(2) + {f}^(2) - c } \\ = √(64 + 25 - 80) \\ = √(9) \\ r = 3 \\ radius \: = \: 3 \: units`