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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.
According to google:22.627417
Google this (87)^(1/2)
The square root of 9.3 is approximately 3.049590. This is calculated by finding the number that, when multiplied by itself, equals 9.3. The square root of a number is a value that, when multiplied by itself, gives the original number.