Question 1087913: Find the standard form of the equation for the circle with center at (-3, -1) and diameter of 2 sqrt 5. Found 2 solutions by solver91311, ikleyn:Answer by solver91311(24713) (Show Source):
Where are the coordinates of the center and is the radius. Note that you have to retain the minus sign that is given in the formula when you substitute a negative number for either h or k. Hence, you end up with x plus something and/or y plus something if either h or k is negative. Don't forget to square r.
John
My calculator said it, I believe it, that settles it
