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Square root of 144 is 12
12 !
Yes; the answer is 12.
The square root of 145 is 12.04 (approx). Since the square root of 144 is 12, it is easy to approximate the square root of 145 because 145 is only very slightly higher than 144.
The square root of 144 is 12.12 x 12 = 144 so the dimensions would be 12cm by 12cm