Building with Triangles


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This 3 lesson instructional unit helps students investigate many different aspects of triangles including basic properties of triangles, building other shapes from triangles, the dependence of the third side length on the other two (Triangle Inequality Theorem), and the Sierpinski Triangle fractal. The lesson includes student activity sheets and links to interactive applets.

Learning Registry Activity


    Topics and Grades

    Grade: TK/K to 6

    Topics: Professional Development, Geometric Figures, Angles & Pythagorean Theorem, Science, Education, Child Development & Family Services, Measurement & Geometry, Measurement, Tools, and Data Analysis, Number Sense, Nature & Method of Science, Mathematics

    Resource Pedagogy

    Resource Type/Classification:

    • Interactives
    • Teacher Materials

    Tool for: Teachers