22.627 (rounded)
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The square root of 64 is 8. When you cube 8, you multiply it by itself three times, which equals 512. So, the cube of the square root of 64 is 512.
It is the square root of 512 which is about 22.627417
If the perimeter is 64, then one side is 16. The diagonal is the hypotenuse of a right triangle. Hello Pythagoras. The answer is the square root of 512 or 16 times the square root of 2.
There is no equality symbol in the question and so no equation!
The principal square root is the non-negative square root.