There is two ways to interpret "5 radical sign'. It can either mean:
five times the square root of 800 leading to:
√(5 × √800) ≈ 11.8921
or, if the five is small and raised slightly it is the fifth root of 800 and it leads to:
√(fifth_root(800)) = (800^(1/5))^(1/2) = 800^(1/10) ≈ 1.9512
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20 times the square root of 2
The square root of 640000 is 800. This is because the square root of a number is a value that, when multiplied by itself, gives the original number. In this case, 800 multiplied by 800 equals 640000.
Expressed as a surd, sqrt(800) = 20 sqrt(2). Expressed as a decimal, rounded to two decimal places, sqrt(800) = ±28.28.
The square root of 900 is equal to 30 the square root of 800 is equal to 20√2, or about 28.28 The number you want would lie somewhere between those two values. If you're looking for a whole number, then 29 meets that condition.
800 square feet = 74.32 square meters.