4.MG.4.a
Identify and describe points, lines, line segments, rays, and angles, including endpoints and vertices.
Khan Academy ResourcesLines, line segments, and rays reviewAngle basics reviewAngle types reviewIdentify points, lines, line segments, rays, and anglesAngle typesRecognize angles in figuresTypes of angles by measureName anglesAngle basicsLines, line segments, & raysAngles: introductionTerms & labels in geometryRecognizing anglesNaming anglesDrawing parallel line segments

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