Golden ratio: Golden rectangles, golden spiral and relation with regular icosahedron.

We had a look at some models for algebra, geometry and trigonometry from school mathematics. Now, models for those results which we do not normally come across in formal study, but math-lovers would be greatly interested in, shall be taken up, of course, with models.
Presented here, by Hema Vasavada, is a demonstration of models for results relating to golden ratio.

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superb class mam
Thank you so much