Unit 1, Lesson 2# Attributes - Triangles and Quadrilaterals

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The construction activity in this lesson allows students to use straight edges to construct triangles and quadrilaterals, giving them an opportunity to develop the mathematical practice of using appropriate tools strategically. They are also developing the mathematical practice of looking for and making use of structure by sorting shapes based on a defining attribute, such as the number of sides or vertices that it has. By asking students to come up with their own sorting strategy rather than telling students how to sort the shapes, the task encourages students to make sense of the problem and persevere in solving it. The comparison and discussion section of the lesson allows students to practice constructing viable arguments by explaining how they sorted their shapes using attributes.