This pie chart visualizes monthly expenses by category, with proportional slices for Rent, Food, Travel, Shopping, and Bills. It uses D3 v7’s `d3.pie` and `d3.arc` generators to compute arc paths, rendered as SVG elements on a 900×500 canvas. A categorical color scale (`d3.scaleOrdinal` with `schemeCategory10`) fills each slice, while labels are positioned using a separate `labelArc` for readability. A legend on the right lists each category with its numeric value, sourced from the CSV data loaded via `d3.csv`.