This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: First pose the question: Here are four triangles. What do all of these triangles have in common? What makes them different from the figures that are no...

This performance task is designed for third grade students and higher to compare and contrast a group of items based on attributes or actions classified into at least two sets and subsets.  The items being classified are polygons.  The use of algorithms and flowcharts is also a key component of the performance task.

This resource can be found in Illustrative Mathematics website. There are a few modifications that were necessary to support the original lesson. Suggested modifications: Instead of providing with an activity, I strongly suggest activating student's background knowledge with a book on "The Greedy Triangle" by Marilyn Burns which encourages literacy in the curriculum. Students often are motivated to write a children's book or a poem, as it allows them to think outside the box. Secondly, the suggested activities will allow students to explore and have a mathematical dialogue about different polygons, and discourage rote memorization of geometric shapes. 

This is a remix of Polygons from Illustrative Mathematics, https://tasks.illustrativemathematics.org/content-standards/tasks/1506.The purpose of this lesson is for students to define and practice identifying polygons to support sol 3.12a and 3.12b.  The lesson starts with a discussion about four polygons (triangles, quadrilaterals, pentagons, and hexagons).  Next, students play a game called 4 corners.  By incorporating movement games and activities in my classroom, the attention and behavior of my students have improved.