You take square roots out of numbers, and certain physical magnitudes (measurements and the like), not out of objects.
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There are different answers for different expressions but essentially, you can either evaluate the expression and then find the square root using a calculator, computer or numerical methods, or you can work out the square root algebraically.
go to system tools and click on Character Map. Select the font "symbol" and then click on the square root
The most common notation is sqrt(#)
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)
There is probably no square root button on the laptop keyboard. Look around in the software on the computer for an application called " Calculator ". That will have a button on it to perform the square root operation, plus buttons for a lot of other operations too.