The equation of the circle in the first quadrant which touches each axis at a distance 5 from the origin is
Find the equation of a circle. (i) which touches both the axes at a distance of 6 units from the origin. (ii) which touches x-axis at a distance 5 from the origin and radius 6 units. (iii) which touches both the axes and passes through the point (2, 1).
(iv) passing through the origin, radius 17 and ordinate of the centre is -15.