Maths-
General
Easy

Question

The equation (x + 6)2 + (y + 3)2 = 121 defines a circle in the xy-plane. What is the radius of the circle?

  1. 11

The correct answer is: 11


    the given equation is left parenthesis x plus 6 right parenthesis squared plus left parenthesis y plus 3 right parenthesis squared equals 121 upon modifying we get
    not stretchy rightwards double arrow left parenthesis straight x minus left parenthesis negative 6 right parenthesis right parenthesis squared space plus space left parenthesis straight y minus left parenthesis negative 3 right parenthesis right parenthesis squared space equals space 11 squared
    On comparison with general from we get radius r = 11

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