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The square root of 20 is an irrational number that can be expressed as 2 times square root of 5
10.49
21 is not a perfect square, and none of its factors (1, 3, 7, 21) are perfect squares either, so √21 is already simplified. The easiest way to compute an approximate value is using a calculator; if you are familiar with calculus, Newton's method works to find an approximation manually. Either way, it is approximately equal to 4.58258.
The square root of 1.425 is approximately 1.194. This value can be found using a calculator or by estimating between known squares. In decimal form, it is often rounded to three decimal places as 1.194.
plug it into a calculator - (square root symbol, insert value of volume, end parenthesis)/(height value, pi symbol)