1.   If you fold a square piece of paper along one of its diagonals, like this:

[[{"fid":"26","view_mode":"default","type":"media","attributes":{"height":238,"width":238,"class":"media-element file-default"}}]]

     then you get a figure like this:

[[{"fid":"27","view_mode":"default","type":"media","attributes":{"height":238,"width":238,"class":"media-element file-default"}}]]

     What kind of triangle is this?  
     Is it a right triangle?  How do you know?  

     Is it an isosceles triangle?  How do you know?

2.   Where in the non-square rectangle below could you fold in order to locate the center of the rectangle?  Show with dotted lines.  What would you write to    convince someone that you have located the center of the rectangle?  

[[{"fid":"28","view_mode":"default","type":"media","attributes":{"height":317,"width":453,"class":"media-element file-default"}}]]

3.  Show where you would fold Square ABCD in order to create a line segment parallel to segment [[{"fid":"31","view_mode":"default","type":"media","attributes":{"height":18,"width":27,"class":"media-element file-default"}}]]

[[{"fid":"29","view_mode":"default","type":"media","attributes":{"height":226,"width":218,"class":"media-element file-default"}}]]

Now show where you would fold Square ABCD in order to create a line segment perpendicular to segment [[{"fid":"54","view_mode":"default","type":"media","attributes":{"height":18,"width":27,"class":"media-element file-default"}}]]

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[[{"fid":"55","view_mode":"default","type":"media","attributes":{"height":226,"width":218,"class":"media-element file-default"}}]]