Bar Chart or Pie Chart?

Is is easier to fill a certain percentage of a bar chart or a pie chart?

Drag point P to fill the bar to the target percentage. Drag point Q to fill the circle to the target percentage. When you are satisfied, click on the SUMBIT button, and then record your data in the google form at the bottom of the page.

Please enter your data! Just the numbers! NO % SIGNS!

The data...