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I am assuming you need the square root of 45m2?

If this is the case, first sort out the perfect squares, so you have 5 * 9m2. Next, take the square root of the perfect squares, while leaving the 5 inside the radical.

(3m) sqrt(5)

Mathematically, that is perfectly correct. However, I would suggest that the units of measurement (m) are left to the last.

So: 3*sqrt(5) m

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Q: What is the square root of 45m2?
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