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Geometry and 3D Printing

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The topic of geometric properties has become the focus of our latest mathematics spiral. The possible connections with spatial reasoning and 3D printing have become quite obvious as we have worked our way through various explorations.

Specific Curriculum Expectations:
- Sort and classify triangles and quadrilaterals by geometric properties related to symmetry, angles, and sides, through investigation using a variety of tools and strategies
- Identify, through investigation, the minimum side and angle information needed to describe a unique triangle
- Determine, through investigation using a variety of tools relationships among area, perimeter, corresponding side lengths, and corresponding angles of congruent shapes
- Demonstrate an understanding that enlarging or reducing two-dimensional shapes creates similar shapes


Exploration 1: Student Guessing Game

Students worked with a partner to classify polygons according to geometric properties. One partner selected a plastic polygon and held i…