Square root of 21
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Sqrt(21). Find the square root of 21 or any other real number, positive or negative. Here are the answers to questions like: Square root of 21 or what is the square root of 21?
What is square root? Definition of square root
A square root of a number 'x' is a number y such that y2 = x, in other words, a number y whose square is y. For example, 4 is the square root of 16 because 42 = 4•4 = 16, -4 is square root of 16 because (-4)2 = (-4)•(-4) = 16. When writing math, people often use sqrt(x) to mean the square root of x. Read more about square root here: Square Root - Wikipedia and here: Square Root - Wolfram
Square Symbol?
Here is the square root symbol. It is is denoted by √, known as the radical sign or radix.
Square root of values around 21
| Number | Sqrt |
|---|---|
| The square root of 20.6 is | 4.539 |
| The square root of 20.7 is | 4.550 |
| The square root of 20.8 is | 4.561 |
| The square root of 20.9 is | 4.572 |
| The square root of 21 is | 4.583 |
| The square root of 21.1 is | 4.593 |
| The square root of 21.2 is | 4.604 |
| The square root of 21.3 is | 4.615 |
| The square root of 21.4 is | 4.626 |
| The square root of 21.5 is | 4.637 |