When is a pie or donut chart appropriate?
Tests judgment of part-to-whole encoding. Answer: use for few categories with clear dominance, cite a share scenario like device traffic, and name angle-comparison difficulty and 3D distortion as pitfalls.
Tests whether you understand part-to-whole encoding and human perceptual limits. A strong answer says pie charts suit only a few categories with one clear dominant slice, gives a concrete scenario like a device-traffic share widget, and names two pitfalls: humans cannot accurately judge slice angles against one another, and 3D or exploded perspectives distort arc lengths to mislead the viewer. Red flag: dogmatically rejecting all pie charts or using them for time series and precise rankings.
Read the original → Wikipedia: Pie chart
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