A directory of useful objects found on the web for teaching Maths.
http://www.mathplayground.com/measuringangles.html
Practise
Practice lining up and reading a protractor while you measure a set of angles. The angles may range from 0° to 180°. The interactive protractor is already lined up with the vertex of each angle but you will have to rotate the protractor into the proper position. The margin of error is only 1° and you must report measurement to the nearest whole number.
5 September 2007 Edit: 29 August 2021
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