smily-face
This example uses React and SVG to draw a smiling face. It shows a yellow circle with a thick black outline, two black eyes, and a black arc for a mouth. The `Circle` component draws the face and eyes, while the `Mouth` component uses d3.arc with inner and outer radii and a start and end angle to create the smile shape, translating it into position. React components render the SVG elements into the page.