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Plato's Protractor™ - I

Students are introduced to the idea of openness.   This aspect of angle needs to be understood to be able to measure angle size. In Plato’s Protractor I the Mathomat kids think of openness as a ratio of arc lengths. They learn to see angle as forming part of a circle, with its size measured by the amount of arc cut-off (subtended) by the angle. Students use the TGT in their Mathomat along with string and a calculator to calculate examples of angle openness


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