What type of graph is used to compare parts of a whole, with a circle representing the whole?

A circle graph, also known as a pie chart, is specifically designed to illustrate how different parts contribute to a whole. It visually represents data by dividing a circle into slices, where each slice corresponds to a specific category and the size of the slice reflects that category's proportion relative to the total. This format allows viewers to quickly understand how various segments compare in size to one another, making it an effective tool for displaying percentages or proportions of a dataset.

In contrast, the other graph types serve different purposes. A bar graph is used to show comparisons between different groups or categories using rectangular bars, while a line graph is useful for depicting trends over time by connecting data points with a line. A histogram is similar to a bar graph but is used to show frequency distributions of numerical data. Each type of graph has its own strengths and applications, but for comparing parts of a whole, the circle graph is the most suitable choice.