This example shows a minimal React application rendering a single SVG visualization: a yellow circle positioned inside an arc segment, centered on a 860×500 canvas. It demonstrates how to integrate D3’s `arc` generator with React’s JSX syntax, computing the arc path from static start and end angles. The code uses React 18’s `createRoot` for rendering and imports D3 v7’s `arc` API directly. The visualization is purely illustrative, with no external data source, and highlights the basic pattern of combining D3 shape generators with React components for SVG output.