University of Texas
Inside Mathematics: Sorting Shapes [Pdf]
This task challenges a students knowledge of 2-dimensional geometrical shapes to sort shapes and to design a shape that has a given set of attributes.
Shodor Education Foundation
Shodor Interactivate: Cross Sections
This lesson utilizes the concepts of cross-sections of three-dimensional figures to demonstrate the derivation of two-dimensional shapes.
Better Lesson
Better Lesson: Introduction to Angles
See this lesson to help students to learn about angles and identify the number of angles in 2D shapes. Lesson plans includes introductory activity, guided practice, and independent practice.
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