Diagramme circulaire

Divide each category's count by the total sum, then multiply by 360 degrees to calculate the sector angle for each slice. Using these angles, divide the circle into proportional slices. The size of each slice directly corresponds to the percentage frequency of that category, allowing visual comparison of relative sizes across all data.

Each slice's size is directly proportional to the numerical proportion or percentage it represents. The central angle, arc length, and area of a slice all correspond to the quantity being displayed. Larger slices indicate higher percentages, while smaller slices show lower percentages, enabling quick visual comparison of data values.

Pie charts work best for categorical data showing relative sizes within a single dataset. Real-world examples include student marks distribution, family monthly expenditure breakdown, and construction cost allocation across materials like steel and cement. They effectively display how individual components contribute to a whole.

Pie charts are simple to use and enable audiences to quickly analyze and understand proportional information at a glance. They facilitate easy comparison of relative sizes and allow viewers to compute actual values for individual categories. Their visual simplicity makes them ideal for presenting categorical data to general audiences.

Pie charts become challenging when displaying large datasets with many categories. Too many slices make it difficult for readers to visualize and assimilate information accurately. In such cases, alternative visualizations like a bar graph may be more effective for comparing numerous categories clearly.

The sector angle calculation directly produces percentage frequency. Dividing a category's count by the total and multiplying by 360 degrees yields an angle proportional to that category's percentage. This mathematical relationship ensures the slice size visually represents the exact percentage frequency of each category in the dataset.

Yes, pie charts can visualize categorical data derived from a frequency distribution. Once frequency counts are organized, sector angles are calculated using the same proportion method. This makes pie charts an effective tool for presenting frequency data visually, showing how different categories contribute to the total count.