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Pie Charts

A pie chart represents data as slices of a circle, showing proportions of a whole. Each slice represents a category's share of the total.

Pie charts work best when you have a small number of categories (ideally 5 or fewer) and want to show how each part contributes to the whole.

Pie charts get a bad rap in the data viz community, but they're perfectly fine for simple proportions. Just don't use them for comparing similar-sized slices – that's where they fall apart.

When to Use Pie Charts

Showing market share or revenue split
Displaying category breakdowns (like sales by store type)
Visualizing budget allocations

When NOT to Use Pie Charts

When you have more than 5–6 categories
When slices are nearly the same size (hard to compare)
When you need precise comparisons (use a bar chart instead)

Assignment

On the "KPIs" page, insert a Pie chart in the top right quarter.
Drag store_type from the stores table to the Legend field.
Drag sale_quantity from the sales table to the Values field.
Format the title: General → Title → Text → "Sales by Store Type"

Save the project and, from the course directory, submit the CLI tests.