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Wittenbauer's Parallelogram - Futility Closet

Summary by Futility Closet
Image: Wikimedia Commons Draw an arbitrary quadrilateral and divide each of its sides into three equal parts. Draw a line through adjacent points of trisection on either side of each vertex and you’ll have a parallelogram. Discovered by Austrian engineer Ferdinand Wittenbauer.
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Futility Closet broke the news in on Monday, May 12, 2025.
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