squarerootcalculator .pro

Sqrt 21

Square Root Calculator

Please enter a real number, then press 'Calculate':

Square root result:

Sqrt(21). Find the square root of 21 or any other real number, positive or negative. Here are the answers to questions like: Sqrt 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

NumberSqrt
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

Square root examples

√1.58√1979√0.133√0.573