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You use the formula A=(pi)r^2 solve for r which will give you the square root of A/pi. In your case the area has pi already in it so it is just 2 times the square root of 8.
The square root of minus 8 is equal to the square root of 8 times the square root of minus 1, or 2.8284i.
4 square root of 7
7 for 49 and 8 for 64
That is because 1x1=1 and to be a square root, a number times the same number, it will be a square root of that number*. *Example 8 times the same number (8) will be 64 and 8 will be the square root of 64.