220
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There are infinitely many of them. They include square root of (4.41) square root of (4.42) square root of (4.43) square root of (4.44) square root of (4.45) square root of (5.3) square root of (5.762) square root of (6) square root of (6.1) square root of (6.2)
approx 0.805 km of fencing. 10 acre = 48400 sq yds ⇒ each side of square = √48400 yds = 220 yds ⇒ perimeter = 4 x 220 yds = 880 yds 1 km ≈ 1094 yds ⇒ perimeter ≈ 880 ÷ 1094 km ≈ 0.805 km
A principal square root is any square root that's answer is positive, and a perfect square root is a square root that's answer is an integer.
square root of 20 = square root of 4 * square root of 5. square root of 4 = 2, so your answer is 2 square root of 5.
Square root (24) - square root (6) = 2.44948974