In the piece ‘Land of the Free, Home of the Poor,’ we used a trio of pie charts broken down into five quintiles to illustrate economic inequality on a country level. One chart represented the ...

Pie charts are one of the simplest ways to visualize information. Their structure is based on simple logic: The largest piece of the pie should begin at the top of the circle, and the values should ...

This means each friend is equivalent to 20° in the pie chart. Image caption, Multiply each frequency by 20 to calculate the angles required. Walk = 8 × 20 = 160. Cycle = 2 × 20 = 40. Car = 5 × ...