Make and test conjectures about geometric properties and develop logical arguments to justify conclusions. 0506.1.1

Links verified on 9/13/2014

1. Building with Triangles - [3 lessons] Each geometric investigation in this unit begins with an open-ended question that engages students in a study of triangles and their properties. [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.]
2. Exploring Properties of Rectangles and Parallelograms Using Dynamic Software - an environment in which students can explore geometric relationships and make and test conjectures
3. Geometric Solids - an interactive tool which allows students to learn about various geometric solids and their properties
4. Geometric Solids and Their Properties - students explore geometric solids and their properties in these five interactive geometry investigations [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.]
5. Geometry in the World of Art - [6 lessons] Students explore geometric shapes and concepts using a virtual geoboard. [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.]
6. Investigating the Concept of Triangle and Properties of Polygons - This two-part example describes activities that use interactive geoboards to help students identify simple geometric shapes, describe their properties, and develop spatial sense.
   1. Creating Polygons - Students make and compare a variety of polygons, describing the salient properties of the shapes they create.
   2. Making Triangles - [Geoboard activity] Focuses attention on the concept of triangle, helping students understand the mathematical meaning of a triangle and the idea of congruence, or sameness, in geometry.
7. Polygon Capture - In the context of a game, students move from a simple description of shapes to an analysis of how properties are related.

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