A pie chart visualizes the top 10 bike models ranked by cost. Each slice represents a bike, with colors assigned via `d3.scaleOrdinal`, and the chart is rendered using D3's `pie` and `arc` functions within an SVG canvas. The legend, positioned to the right, uses `d3.select` and `d3.arc` to list bike names and their costs in thousands. Data is loaded asynchronously from a CSV using `d3.csv`, with cost values formatted via `d3.format`. Text labels at slice centroids display the bike names, though the code sets the fill to black and font size, which may affect readability against colored slices.