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Thread: Ph, root five, fifth powers and 72

  1. #1 Ph, root five, fifth powers and 72 
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    "72 is the smallest number whose fifth power is the sum of five smaller fifth powers: 195 + 435 + 465 + 475 + 675 = 725"

    "In a plane, the exterior angles of a regular pentagon measure 72 degrees each"

    Are these things related in any way? Read this on wikipedia and remembering the root 5 in phi, got to wondering...


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  3. #2  
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    72 deg. = 2π /5. The number 72 has no particular mathematical significance for angle. It looks like a coincidence.


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