The square root of 660 is approximately 25.69046515733026, or about 26 when rounded to the nearest whole.
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2 times the square root of 165
There are 9 square feet in one square yard. Therefore, 660 square feet is equal to 660/9 = 73.3 recurring (that is, 73.3333...) square yards.
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)
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.