Go 140 units of distance in any direction. Turn 90 degrees clockwise and go 140 units of distance in a straight line. Turn 90 degrees clockwise and go 140 units of distance in a straight line. Turn 90 degrees clockwise and go 140 units of distance in a straight line.
You will have travelled along a square route whose total distance is 560 units. Alternatively you could have turned counter clockwise each time.
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sqrt(560) = 4*sqrt(35)
Answer: 560 ft² = 52.0257 m²
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)
52.025 square meters.
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.