This answer is rounded to 14 decimal places.
Exact answer: 6.29285308902091
Between 6 and 7
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Searching Google with "square root of 396" gave 19.8997487421 (round to 19.9). To discover the method used to calculate the sq root, search Google.
Total square feet: 396.0
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.