The equation (x + 6)^2 + (y + 4)^2 = 36 models the position and range of the source of a radio signal. describe the position of the source and the range of the signals

A circle equation is :
( x - p )² + ( y - q )² = r², where p and q are coordinates of the center.
The position of the source is : ( - 6, - 4 ) and the range :
r² = 36   ⇒   r = 6

3cm and 6 and 9 cm that a possibility of that question