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The perimeter of a square with a diagonal of 12 centimeters is: 33.9 centimeters.

In future, to find out the perimeter of a square when you only know it's diagonal, use Pythagoras or times the diagonal by 2.828427125.

This number is irrational, and is like a pi for the diagonals of squares.

I call it Tau.

It is the relationship between the diagonal of all squares and there perimeter.

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Q: What is the perimeter of a square with diagonal 12 centimeters?
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