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A pie chart is a circular statistical graphic that is divided into slices to illustrate numerical proportions. Each slice represents a category's contribution to the total, making it easy to visualize relative sizes. In this context, the pie chart will display the gross revenue of different movie studios as parts of a whole, allowing for quick comparisons.

Data representation involves organizing and presenting data in a visual format to facilitate understanding and analysis. In the case of the box office revenues, representing the data in a pie chart helps to convey the distribution of revenue among the studios clearly, highlighting which studios dominate the market and how they compare to one another.

Proportional relationships refer to the way in which two quantities relate to each other in terms of their size or amount. In the context of the pie chart, the size of each slice corresponds to the proportion of each studio's revenue relative to the total revenue of all studios combined. Understanding these relationships is crucial for interpreting the pie chart accurately.