Objective: Use a circular protractor to understand a 1-degree angle as 1/360 of a turn. Explore benchmark angles using the protractor.
Beginning in Lesson 5 with a circular protractor, students divide the circumference of a circle into 360 equal parts, with each part representing 1 degree (4.MD.5). Students apply this understanding as they discover that a right angle measures 90° and, in turn, that the angles they know as acute measure less than 90°, and obtuse angles measure more than 90°. The idea that an angle measures the amount of turning in a particular direction is explored, providing students with the opportunity to recognize familiar angles in varied positions (4.G.1, 4.MD.5).
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