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Proof Without Words: The Area of an Inner Square

Marc Chamberland
The College Mathematics Journal
Vol. 44, No. 4 (September 2013), p. 322
DOI: 10.4169/college.math.j.44.4.322
Stable URL:
Page Count: 1
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Summary What is the area of the (inner) square obtained by slicing the corners off a larger square? This visual proof avoids algebra by considering the area of a parallelogram.

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