Empty protractor | Mathematics - Association of Teachers of Mathematics

"The use of a protractor is twofold, viz, to lay down an angle or to measure an angle already laid down." (Meredith, 1791). 

Tom Francome, Lecture in Mathematics Education at the University of Birmingham describes how he uses an empty protractor to develop pupils' understanding of angle. 

Protractors  are  used  routinely  in  schools,  typically from year five (9-10 years) onwards...

The attached document has been downloaded or otherwise acquired from the website of the Association of Teachers of Mathematics (ATM) at www.atm.org.uk.

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Source: The Association of Teachers of Mathematics (ATM)