Final answer:
The two commonly used clauses for charts are pie charts and bar graphs, which help in representing parts of a whole and comparing different data points, respectively.
Step-by-step explanation:
The question is asking about commonly used clauses for chart representation in data visualization. Two common types of graphs for displaying qualitative data are pie charts and bar graphs. A pie chart is useful when wanting to show parts of a whole, as the wedges in the circle visually represent the percentage that each category contributes to the overall dataset. For comparing data points or showing trends, bar charts are typically utilized, which employ vertical bars to make quick comparisons between different groups.