Courtesy of Hector (h-j-hill):
If you want my image of the protractor in high resolution, click on the image below.
Then click on the image that downloads.
Right-click on the enlarged image and choose 'save' or 'paste'.
Set the printed image size to 10 inches (254 mm) and the scale should be correct.
OR SIMPLY MEASURE the 9 (or 9.3) mm indicated in the diagram.
You can do that
at the workbench; and it has to be within the margin of error in making and using the protractor.
