{"version":"1.0","type":"rich","title":"practice 1 - Circle around circle","description":"This example displays a set of concentric circles centered on a fixed point, each filled with a different color and outlined in black. A small red circle is appended separately within the same SVG group. The visualization is built using D3 v5’s `select` and `append` methods to create SVG circles, with positions and radii driven by an array of JavaScript objects. The colored circles are stacked using `data.reverse()` to layer them from largest to smallest.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/9595822af2dd4710b13e939aaba05003?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}