A bit less than 6.5
One way to answer this is that 42=2x3x7, so it's sqrt(2)*sqrt(3)*sqrt(7) but that's probably not very helpful.
If you have a calculator which is just one tiny step up from the most basic, you can just do [square root key], [42], [=], and you will get 6.4807..., or say about 6.5.
Check by going 6.5*6.5 = 42.25, or 6.48*6.48 = 41.9904.
Also note that 62 = 36 and 72 = 49, and 42 is a bit less than half-way from 36 to 49, so it makes sense that the square root of 42 is just under 6.5
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The perfect square of 42 is 42 x 42 or 1,764.
Yes the square root of 1764 is 42
The answer is in the question. 42 square meters would be 42 meters long, 42 meters wide, 42 meters from corner to corner. To convert the 42 square meters into yards, there is .84 meters in one square yard, .09 square meters in a square foot. I realize that the Metric System is difficult to learn at first, but you will get the hang of it.
42.00
42 square units