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No. 69.5 is half of 139. The square root will be between 11 and 12.
0.5
The square root of 144 is 12 12
The square root of 12 equals the square root of 4 times 3. The square root of 4 is 2. The square root of 12 equals 2 times the square root of 3.
The square root of -12 is: 3.4641016151377544 i