How to resize circle in d3.js?

@dalton_moen 

To resize a circle in d3.js, you can use the attr method to change its radius. Here is an example code snippet:

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// Select the circle element
var circle = d3.select("svg").select("circle");

// Set the new radius
var newRadius = 50;

// Resize the circle
circle.attr("r", newRadius);

In this code snippet, the d3.select method is used to select the circle element in the SVG. Then, the attr method is used to change the "r" attribute of the circle to the new radius value of 50. This will resize the circle to have a radius of 50.