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See The New Mathomat R300 Ruler

Plato's Protractor™ - IV

The Mathomat kids are introduced to radians as a unit of angle measure. They do this by using the quip length strings from the previous protractor building activity, to create a new protractor which has a radius equal to the length of their quip length strings. They mark and draw angles of different magnitudes measured in radians.


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