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9 sq ft = 1 sq yard so 756 sq ft = 756/9 = 84 sq yards.
8747
756/189 = 4756/84 = 9756/21 = 36
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.