It is so very simple and quick to get the answer, especially since you can use the calculator that comes with your computer. But since you are obviously not able to do so, the answer is 35.92, approx.
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1,290 is not a perfect square. The approximate square root is ± 35.916569992136
Well, isn't that just a happy little question! The greatest perfect square of 1290 is 36, because 36 x 36 equals 1296, which is the closest perfect square to 1290. It's all about finding the beauty in numbers and appreciating the little surprises they bring.
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.