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September 21, 2014

September 21, 2014

Posted by **selva** on Monday, October 13, 2008 at 5:30am.

- geometry -
**drwls**, Monday, October 13, 2008 at 5:33amUse rules for congruent triangles (the four corners that get lopped off) to show that the four sides of the new quadrilateral are equal, and that the corner angles are right angles. That proves it to be a square also.

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