Lesson plan

1. Understand that angles are geometric figures (C)

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.MP3 http://corestandards.org/Math/Practice/MP3

You have saved this lesson plan!

Here's where you can access your saved items.

Dismiss

Sign up or log in to view additional materials

You'll gain access to interventions, extensions, task implementation guides, and more for this lesson plan.

Lesson objective: Understand that angles are geometric figures.

Students bring prior knowledge of polygons from 2.G.A.1. This prior knowledge is extended as, in the process of composing and decomposing shapes, students consider geometric building blocks such as angles. A conceptual challenge students may encounter is combining rays to create a new geometric figure, an angle.

The concept is developed through work with models of rays, which can be arranged in different ways to compose new geometric figures.

This work helps students deepen their understanding of number because the number of geometric building blocks used to create a figure can help to define it.

Students engage in Mathematical Practice 1 (Make sense of problems and persevere in solving them) as they consider different arrangements of rays as they construct a model of a hexagon.

Key vocabulary:

• angle
• attribute
• closed
• endpoint
• figure
• polygon
• quadrilateral
• ray
• vertex
Related content
Appears in
• 1. Understand that angles are geometric figures (C)