What is the radius of the smallest circle that contains both of the circles x^2 + y^2 = 1 and (x - 1)^2 + (y - 2)^2 = 4?
"What is the radius of the smallest circle that contains both of the circles x^2 + y^2 = 1 and (x - 1)^2 + (y - 2)^2 = 4?"
