Orthogonal circles

desmos

To add animation:
1) Add a representative GREEN circle: (x-C)^2 + y^2 = C^2
2) Add a representative ORANGE circle: x^2 +. (y-K)^2 = K^2
3) Find a point of intersection:
• Plug in an arbitrary value for x, say a.
• Solve each equation for y.
• Set y = y and solve for a.