Go 85 units of distance in any direction. Turn 90 degrees clockwise and go 85 units of distance in a straight line. Turn 90 degrees clockwise and go 85 units of distance in a straight line. Turn 90 degrees clockwise and go 85 units of distance in a straight line.
You will have travelled along a square route whose total distance is 340 units. Alternatively you could have turned counter clockwise each time.
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That's the same as the square root of positive 340, times i. Many calculators can't calculate the square root of negative numbers, since they are not set up to calculate with complex numbers, but you can simply calculate the square root of the equivalent positive number, then add "i" to the result.
340 square feet = 31.587 square meters (rounded)
There are infinitely many of them. They include square root of (4.41) square root of (4.42) square root of (4.43) square root of (4.44) square root of (4.45) square root of (5.3) square root of (5.762) square root of (6) square root of (6.1) square root of (6.2)
A principal square root is any square root that's answer is positive, and a perfect square root is a square root that's answer is an integer.
square root of 20 = square root of 4 * square root of 5. square root of 4 = 2, so your answer is 2 square root of 5.