What is the square root of -47?

Answer 1

The square root of 47 is not a rational number. We know that 6 x 6 = 36 and 7 x 7 = 49, so the answer is between them. If we use a handheld or online calculator, we'll get 6.85565 for an approximate answer. And that plus or minus 6.85565 because the square root of a positive number always has the two answers.
The square root of 47 is an irrational number and it is about 6.8556546

Answer 2

Go 11.75 units of distance in any direction. Turn 90 degrees clockwise and go 11.75 units of distance in a straight line. Turn 90 degrees clockwise and go 11.75 units of distance in a straight line. Turn 90 degrees clockwise and go 11.75 units of distance in a straight line.

You will have travelled along a square route whose total distance is 47 units. Alternatively you could have turned counter clockwise each time.