The sum of all numbers is
The sum of diagonal numbers is
Now
Why do the sum of all numbers in any square / sum of square diagonal numbers = the square root?
123
456
789
1+2+3+4+5+6+7+8+9 = 45
1+5+9 or 3+5+7 = 15
I am mathematically challenged, an explanation in words or a link where I can learn more would be helpful.