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KGS math club/solution 11 20

Revision as of 14:22, 14 August 2012 by Flyingdario (talk | contribs) (Created page with "By drawing all diagonals and looking at angles we see that the triangles formed by {c, d, d} and {c, c, d-c} are similar. Then c : d = (d-c) : c After that few calculations le...")
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By drawing all diagonals and looking at angles we see that the triangles formed by {c, d, d} and {c, c, d-c} are similar. Then c : d = (d-c) : c After that few calculations lead to c : d = $(sqrt(5)-1)/2$

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