Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: 
Circle graphs are especially useful for showing percents of a whole. The circle graph in Figure below shows the percent of all vehicles counted that were of each type.


Question: What type of graph is useful for showing percents of a whole?
circle graphs
Circle graph.