What type of graph can show several variables simultaneously?

The polygon, specifically in the context of data visualization, can effectively display multiple variables simultaneously. A polygon graph, often referred to as a line graph for area comparisons, connects points that represent different variables over a common scale. This allows for the comparison of various sets of data in a single view, demonstrating relationships between them. For instance, in a polygon representing different categories, each vertex can represent a different variable, enabling observers to see trends and fluctuations across these variables at once.

In contrast, while histograms and line graphs can show relationships between two variables across a time continuum or frequency distribution, they generally focus on a singular axis or measure at a time. Pie charts are limited to representing part-to-whole relationships and do not comfortably convey multiple variables in a cohesive manner, making the polygon the more suitable choice for simultaneous variable representation.