Description
In Topic B, students explore the definition of degree measure, beginning with a circular protractor. By dividing the circumference of a circle into 360 equal parts, they recognize one part as representing 1 degree (4.MD.5). Through exploration, students realize that, although the size of a circle may change, an angle spans an arc, representing a constant fraction of the circumference. By carefully distinguishing the attribute of degree measure from that of length measure, the common misconception that degrees are a measure of length is avoided. Armed with their understanding of the degree as a unit of measure, students use various types of protractors to measure angles to the nearest degree and to sketch angles of a given measure (4.MD.6). The idea that an angle measures the amount of turning in a particular direction is explored as students recognize familiar angles in varied contexts (4.G.1, 4.MD.5).
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Credits
From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 4, Topic B Overview.
Available from engageny.org/resource/grade-4-mathematics-module-4-topic-b-overview; accessed 2015-05-29.
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