the equation of the circle which touches both the axis and whose centre is (x1 , y1) is
The equation of a circle with centre at (x1, y1) and radius equal to r is (x - x1)2 + (y - y1)2 = r2.
When the circle touches both x-axis and y-axis i.e., x1 = y1 = r.
Then the equation (x - r)2+ (y - r)2 = r2
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