A simple SVG face built with React and D3, rendered as a green circle with orange stroke, two black eyes, and an orange mouth arc. The eyes sit at symmetric offsets above the center, while the mouth is drawn separately using a D3 `arc` path generator positioned lower on the canvas. The code defines geometric constants for size and placement, then constructs the face from basic SVG shapes. It demonstrates combining React components for layout with D3’s `arc()` API to generate path data for the sad expression.