# Regular Decagon Magic!

Can you find evidence of the

**golden ratio**anywhere in this animation? If so, where? Explain. What is the measure of the**pink angle**? How do you know this to be true? See any**Golden Triangles**? See any**Golden Gnomons**? What is the exact value of the ratio of the**brown segment**to the**segment with 3 hash marks**?**How can we formally prove any of the phenomena dynamically illustrated here?**## Quick (Silent) Demo

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