Acircle in the x y xyx, y-plane has the equation: 3 . 5 ( x + 2 . 2 ) 2 + 3 . 5 ( y − 1 1 . 1 ) 2 − 2 1 = 0 3.5(x+2.2) 2 +3.5(y−11.1) 2 −21=0space, 3, point, 5, left parenthesis, x, plus, 2, point, 2, right parenthesis, start superscript, 2, end superscript, plus, 3, point, 5, left parenthesis, y, minus, 11, point, 1, right parenthesis, start superscript, 2, end superscript, minus, 21, equals, 0 what is the radius of the circle? round the answer to the nearest tenth.