# 2. Using plane figures to understand geometric components (FP)

teaches Common Core State Standards CCSS.Math.Content.4.G.A.1 http://corestandards.org/Math/Content/4/G/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Lesson objective: Draw and identify points, lines, line segments, rays, and angles.

This lesson helps to build procedural skill with identifying and drawing points, lines, line segments, rays, and angles . This work develops students' understanding that points, lines, line segments, and rays have specific properties that are maintained when combined to make geometric figures. One of these new figures, an angle, is a geometric figure that is created wherever two rays share a common endpoint.

Students engage in Mathematical Practice 4 (Model with mathematics) as they analyze relationships among goemetric figures to draw conclusions about how they are used to identify and create shapes.

Key vocabulary:

• angle
• attribute
• closed
• endpoint
• figure
• line
• line segment
• point
• polygon
• ray
• vertex

Special materials needed:

• ruler
• grid paper
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