Question

What is the square root of 21​

Answer 1

About 4.5.

Explanation:

It is between 4 ( 4^2 = 16) and 5 (5^2 = 25).

Its about 4.5 (4.5^2 = 20.25)

A calculator will give you a more accurate answer.

The calculator gives the value 4.582575695.

Answer 2

4.583 is the square root of 21.