Recreational Math Christmas Tree Problem (with visual proof)

Like this video? You might like Roger Nelsen's Proofs without Words books (I may receive a small commission at no cost to you for these affiliate links):
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In this short video, we pose a fun problem from the 1976 Journal of Recreational Mathematics and give a visual proof that is featured in Roger Nelsen's Third Proof without Words Compendium.

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For other visual geometric proofs like this check out:

For a static version of this proof, see Roger Nelsen's third "Proof Without Words: Exercises in Visual Thinking" compendium (page 39) :
(I may receive a small commission at no cost to you for these affiliate links):
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