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CBSE Class 11 maths NCERT solutions Circle Class 11 maths ncert solutions – Circle Circle:   A circle is the set of all points in a plane which is at a fixed distance from a fixed point in the plane. The fixed point is called the  centre  of the circle and the distance from the centre to any point on the circle is called the  radius  of the circle. Question:  Find the equation of the circle with centre (1, 2) and radius 3. Solution:  We have   h = 1 ,k = 2 and r = 3 So equation of the circle is (x-1) 2  + (y-2) 2  = 3 2 or (x-1) 2  + (y-2) 2 =9 For  NCERT maths solutions class 11  practice sets of Conic Sections & more, Click at  Class 11 th  Maths online classes  Question:  Find the centre and radius of the circle  x 2  +  y 2  -2 x + 4 y  – 8 = 0. Solution:  First of all,we write the given equation in the form ( x 2  – 2 x ) + (  y 2  + 4 y ) = 8 Now, completing the squares, we get ( x 2  – 2 x  + 1) + (  y 2  + 4 y  + 4) = 8 + 1 + 4 ( x  –