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Square as a Sum
Depiction of how a square can be expressed as a sum of odd numbers.
Euclids Elements - Book 2 - Proposition 14
One of my favorite apps because it looks deceptively simple, but takes some really creative thinking. This app creates a square (in red) that has the same area as a given quadrilateral.
Drag the tangrams to make your favorite shape. Then press Go to see them move from their square to your shape.
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