When describing how well a speaker projects or a microphone receives sound at different angles of incidence, a polar chart is a swell way to show the data.    Its easy to catch anomalies when looking at the polar chart.  Much more so than looking at a list of numbers.

Please see google images for examples, here.

Methods for producing polar charts include:

• copying a blank chart into google images and drawing in your measurements

• Printing a blank chart and hand drawing the measurements, then scanning the drawing.

• Preferred:  enter the data into a spread sheet and print a polar chart from that data.