Look around you. How would you describe the shapes that make up where you live and go to school? This is one of the ways that mathematical thinking is not quite the same as numerical thinking. (Although numbers are sometimes the perfect way to describe different qualities about the shape!)
In this article, we define polygons and describe some basic ways to classify triangles and quadrilaterals. Then we provide two lessons for students in Grades 2 and up: one where students are introduced to the names for different polygons (Identifying Polygons), and one where they practice classifying triangles and quadrilaterals (Classifying Polygons).
What Is a Polygon?
When people hear the word geometry, they tend to think about shapes. Many of these shapes, or polygons, can be described as flat, closed figures with three or more sides. Polygons are two-dimensional objects, not three-dimensional solids. Encourage students to explore different ways to classify polygons. Point them towards ideas like counting sides, measuring angles, and comparing side lengths (for instance, looking for congruent sides). Many polygons have special names, which may be familiar to your students.
Be the first to read the latest from Shaped.