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 × ...

Today, we update one of our favorite charts, which looks at how orders route ... and how orders are handed by brokers, means each pie actually works quite differently to the others.