Three Sides
http://illuminations.nctm.org/LessonDetail.aspx?ID=L81
A lesson plan for grades K–1 Mathematics
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This lesson, one of a five-part unit from Illuminations titled “Investigating Shapes: Recognizing, Constructing, and Identifying Triangles,” students identify and recognize triangles using multiple representations. Students use attribute-blocks and engage in several activities while exploring the characteristics of triangles.
North Carolina Curriculum Alignment
Mathematics (2004)
Grade 1
- Goal 3: Geometry - The learner will identify, describe, draw, and build basic geometric figures.
- Objective 3.03: Compare and contrast geometric figures.
- Objective 3.04: Solve problems involving spatial visualization.
Kindergarten
- Goal 3: Geometry - The learner will explore the concepts of geometry.
- Objective 3.01: Identify, build, draw, and name triangles, rectangles, and circles; identify, build, and name spheres and cubes.
- Objective 3.02: Compare geometric shapes (identify likenesses and differences).
- Objective 3.03: Model and use directional and positional vocabulary.
- Objective 3.04: Complete simple spatial visualization tasks and puzzles.
