Try holding down alt and typing 251 on the numpad. √
or on a Macintosh, option-v √
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For right angled triangles it is the square root of square of side A added to square of side B (sorry i don't have a square sign on my keyboard) hypotenuse=square root of AxA+BxB
you buy a calculator and put the square root sign and the number you want to square root.
√3 Use the check mark. Alt or Option v on a Mac
The symbol for a a square root sign is: √
It is unlikely that you have a built in shortcut key. However, if you are using Microsoft Word you can set up a custom hotkey. A square root sign has character code 221A - you can find it under Insert: Symbol. From there you can set a keyboard shortcut; I've just set mine to Ctrl + SQ, which works fine. The standard shortcut key is "ALT"+ X