Geometry+2.0

Students write geometric proofs, including proofs by contradiction.
 * __Geometry 2.0__**

1. A theorem is a _that is _. 2. The theorem is _because a can be _ 3. If a theorem is _, the proof requires _ and _.

1. A postulate is a _ that is _. 2. A postulate is _ because it can not be. 3. If a postulate is __, the proof _.

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