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Chris Harrow

Magic Square -- from Wolfram MathWorld - 0 views

mathworld.wolfram.com/MagicSquare.html

Proof uniqueness

shared by Chris Harrow on 12 Nov 14 - Cached
  • Chris Harrow on 12 Nov 14
     
    Number of unique magic squares. >There is (1) 1x1 square--duh. >Interesting that there are (0) 2x2 squares.  Place any number in any corner--both adjacent corners must be the same number, preventing a square.   Can a 5th grader follow this?  >There is (1) 3x3 square. Can be reasoned out by cases. Can 5th grader follow? >There are (880) unique 4x4 squares. Very interesting that this number jumps so quickly. >Stunning:  There are (275,305,224) unique 5x5 squares.  WOW! >>We don't know how many 6x6 squares there are.  
Chris Harrow

geometry - Does the square or the circle have the greater perimeter? A surprisingly har... - 0 views

math.stackexchange.com/...rimeter-a-surprisingly-hard-pr

5 triangles circle square perimeter

shared by Chris Harrow on 22 Mar 15 - No Cached
  • Chris Harrow on 22 Mar 15
     
    Another lovely problem from @FiveTriangles
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