Differentiated circumference of a circle self marking quiz (unlimited questions)

Great to set students for electronic homework. They can print off the worksheet afterwards and stick it it. Questions should be entirely random (I would advise the students to refresh the questions initially).

See https://goo.gl/dDno4h for a more basic free version of just finding the circumference.

Differentiated quiz on the following:
-Work out the circumference of a circle
-Work out the radius or diameter length when given the circumference
-Work out the arc length
-Work out the perimeter of a sector

Features:
-Hint button that shows/hides a hint
-Press a button and it will self mark and give a score out of 10
-Refresh the questions so you get any entirely new set of questions (basically unlimited questions!)
-Print the page

You will need to enable Macros for this to work (there should be a yellow bar that pops up when you open a file that you can enable macros from)
See here if you need any additional help with this:
https://support.office.com/en-us/article/Enable-or-disable-macros-in-Office-files-12b036fd-d140-4e74-b45e-16fed1a7e5c6