Description
Topic A begins with students drawing points, lines, line segments, and rays, as well as identifying these in various contexts and within familiar figures. Students recognize that two rays sharing a common endpoint form an angle (4.MD.5). They create right angles through a paper-folding activity, identify right angles in their environment, and see that one angle can be greater (obtuse) or less (acute) than a right angle. Next, students use their understanding of angles to explore relationships between pairs of lines as they define, draw, and recognize intersecting, perpendicular, and parallel lines (4.G.1).
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Credits
From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 4, Topic A Overview.
Available from engageny.org/resource/grade-4-mathematics-module-4-topic-overview; accessed 2015-05-29.
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