Question

Find the radius of the circle defined by the equation below.

x2 + y2 - 8x + 6y - 11 = 0

3

6

9

12

Answer 1

@amistre64

Answer 2

@phi

Answer 3

@aaronq

Answer 4

@SithsAndGiggles

Answer 5

The general equation of a circle with center (a, b) and radius r is: (x-a)^2 + (y-b)^2 = r^2.
Ifyou can rewrite the given equation in this form, you'll have your radius.
Method: completing the square. Hope this rings a bell...

Answer 6

ok

Answer 7

Its 3?