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  Polyhedra

 
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What a teacher may act
What a teacher may say
Depending on time availability, bring the class together after 30-45 minutes or the next day. Ask student pairs/groups to bring their notebooks and one of the objects they built to the center (best) or front of the classroom and place it on a table in full view of everyone. Ask builders,

Read what you wrote about this structure in your notebooks?

Encourage them to describe the object using their notebook descriptions to foster documentation of assertions . Draw the object on the overhead/chart paper and record the authors' description. Number it 1.

 

Provide an opportunity for oral revision of written description. Add any other features offered by the authors.

What else would you like to add about it?

Open discussion of the features of the object to the whole group and transcribe their offerings .

What would anyone else like to say about it?

If a pair/group(s) volunteers another structure, have them bring it and their notebooks forward, one object at a time.

Does someone have one that is like this?

Ask ,

What did you write about this structure? How is it like the first one?

Record their descriptions and explanations. Ask the class ,

How is this like the first one?

Record their responses. Keep pushing students toward clarification by questioning their use of language to describe the similar and dissimilar aspects of the structures. For example, "Keisha called this an edge, but Stewart called it a side." Or, "Both Tyrone and Minyong called this (concave) a corner. Why? If that is a corner, what is this (convex)?  
Ask for another and continue the process. When the objects "like" the first one are exhausted, say, Let's summarize what we know about these objects. We've decided that they are alike in some way(s). What are those ways?
Last Updated: July 11, 2005
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