A bar graph has 8 bars, all the same height. Suppose that a circle graph were used instead of a bar graph to represent the data. What percent of the data would each piece represent.

If all 8 bars on a bar graph have the same height, you know they must be equal.

Therefore, you must break 100%-the entire, uncut circle graph-into eight equal pieces.

100 divided by 8 = 12.5, so each piece would represent 12.5% of the data.