The equation of the circle which touches x-axis and whose centre is (1, 2) is a) x2 +y2 ?2x+4y+1=0 b) x2 +y2 ?2x?4y+1=0 c) x2 +y2 +2x+4y+1=0 d) x2 +y2 +4x+2y+4=0
The equation of the circle which touches x-axis and whose centre is (1, 2) is a) x2 +y2 ?2x+4y+1=0 b) x2 +y2 ?2x?4y+1=0 c) x2 +y2 +2x+4y+1=0 d) x2 +y2 +4x+2y+4=0