How Do You Build Triangles?
http://illuminations.nctm.org/LessonDetail.aspx?ID=L234
A lesson plan for Grades K–2 Mathematics
About this resource
- Appropriate grades
- K–2
- Provider
- National Council of Teachers of Mathematics
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In this lesson, the second in a four-part unit from Illuminations titled “Triangles,” students investigate basic properties of triangles. They then investigate the relationships among basic geometric shapes and communicate their findings to their peers.
North Carolina Curriculum Alignment
Mathematics (2004)
Grade 1
- Goal 3: Geometry - The learner will identify, describe, draw, and build basic geometric figures.
- Objective 3.01: Identify, build, draw and name parallelograms, squares, trapezoids, and hexagons.
- Objective 3.02: Identify, build, and name cylinders, cones, and rectangular prisms.
- Objective 3.03: Compare and contrast geometric figures.
- Objective 3.04: Solve problems involving spatial visualization.
Grade 2
- Goal 3: Geometry - The learner will perform simple transformations.
- Objective 3.01: Combine simple figures to create a given shape.
- Objective 3.02: Describe the change in attributes as two- and three-dimensional figures are cut and rearranged.
- Objective 3.03: Identify and make:
- Symmetric figures.
- Congruent figures.
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.
