200%.
Careful here! An 800% increase is equivalent to multiplying by 9 - NOT 8. So the sides need to be multiplied by sqrt(9) = 3. That is an increase of 200%
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Each side will increase by the square root of 69 (approx. 8.3).
That would depend on the original side lengths of the square which have not been given.
Time period is directly proportional to the square root of the length So as we increase the length four times then period would increase by ./4 times ie 2 times.
66