Select the other number so that it is bigger than the square number!
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Make a square using four of the sticks. Make an identical square with the other four sticks. Place the second square so that it overlaps one quarter of the first square. The third square is the small square created by the overlap and is 1/4 the size of the bigger squares.
Start with a magic square which includes the number 3. Then either: Add 3 to each number, or Multiply each number by any integer other than 3.
a pentagon.
Well, the basic idea is that every positive number is the square of some number. For example, 2 is the square of a number known as the square root of 2; 3 is the square of a number known as the square root of 3; etc. The "perfect squares" are the squares of integers. That would make all other numbers "non-perfect squares", though this term is not usually used in practice.
All numbers can make a square. Every real number makes a positive real square. Every rational number makes a rational square. Every integer makes a perfect square.