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Parallelogram Illusion


ParallelogramIllusion

In the above figure, the sides a and b have the same length, appearances to the contrary.

ParallelogramTriangleIll

In the related illusion illustrated above, the interior lines appear to be of different lengths, despite the fact that they are the same (Wells 1991).


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References

Wells, D. The Penguin Dictionary of Curious and Interesting Geometry. London: Penguin, pp. 86-87, 1991.

Referenced on Wolfram|Alpha

Parallelogram Illusion

Cite this as:

Weisstein, Eric W. "Parallelogram Illusion." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ParallelogramIllusion.html

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