Description
Topic C begins by decomposing 360° using pattern blocks, allowing students to see that a group of angles meeting at a point with no spaces or overlaps add up to 360°. With this new understanding, students now discover that the combined measure of two adjacent angles on a line is 180° (supplementary angles), that the combined measure of two adjacent angles meeting to form a right angle is 90° (complementary angles), and that vertically opposite angles have the same measure. These properties are then used to solve unknown angle problems (4.MD.7).
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Credits
From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 4, Topic C Overview.
Available from engageny.org/resource/grade-4-mathematics-module-4-topic-c-overview; accessed 2015-05-29.
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