Which graph is best for representing percentages of a whole?

• A. Circle graph
• B. Bar graph
• C. Histogram
• D. Line graph

Answer: (A)

When you want to show percentages that add up to a single whole, a circle graph is the clearest choice. The entire circle represents 100%, and each slice’s size comes from its percentage of that total. That setup lets you see at a glance which parts are bigger or smaller and exactly how each part compares to the whole.

Bar graphs can compare quantities across groups but don’t inherently tie those quantities to a single total, so the sense of “parts of a whole” isn’t as immediate. Histograms focus on distributions of a variable, not shares of a total, and line graphs show changes over time or order rather than proportional shares. So for illustrating percentages of a whole, the circle graph communicates the idea most effectively.