Engage: Begin lesson with an angle sort. Working in groups, students will be given a set of angles that need to be sorted according to attributes. No criteria should be set. Students need to decide within their groups what attributes they deem important. Angles and triangles will be included in the sorting set. Students do not need to classify triangles by side length (scalene, isosceles, right).
Explore: Students will create criteria for each group of angles they have made. They should be asking themselves, “WHY?” they put each angle in the group it is in.
Explain: Groups then shareout their reasoning. Students will affix their angles to the whiteboard and label them according to their attributes. With each additional group that goes up, they may add to an existing category or create their own category. They can also change the explanation another group has presented. They may not disagree with a group unless they can provide a valid argument as to why it isn’t so.
Elaborate:
Students return to their groups and teacher revisits each category on the board. Attributes are clarified and the category is named according to the attributes if this has not been done so already. Categories that should be combined are at this point. If any new categories should be created, they are. Each angle on the board is tested with a 90^{o} corner of math chart as this is the tool they should use on the test.
Evaluate:
Revisit the previous day’s lesson. Clear up any clear misconceptions students may have.
Students that are still struggling will be pulled into a small group while the remaining students move on the interactive activity. Once the group is successfully explaining how the attributes of an angle decide its classification, they may join the computer activity.
Visit the National Library of Virtual Manipulatives and enter the Geoboard circular activity.
Students must create examples of right, acute, and obtuse angles by using the virtual rubber bands on the circular geoboards.
http://nlvm.usu.edu/en/nav/frames_asid_127_g_2_t_3.html?open=activities&from=topic_t_3.html

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