Unit 1, Lesson 3# Right Angles

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The construction of a right angle tool to explore their classroom space to find other right angles using a direct comparison method will allow the students the opportunity to develop the mathematical practice of using appropriate tools strategically. The design of the task as an active investigation of the students' classroom space is intended to be high interest to encourage students to make sense of the task and persevere in finding right angles throughout their classroom environment. Having students use a direct comparison method to justify that the angle they have discovered is a right angle gives students the opportunity to construct a viable mathematical argument. The comparison and discussion portion of the lesson gives students a framework to develop the mathematical practice of communicating their ideas to others and also to evaluate the ideas of their classmates.