A picture of an equilateral triangle is reduced by 75 percen

The question should have mentioned that the copier reduces the size such that the sides are reduced by 75% for clarity. Not given anything, I might have still assumed that the lengths of the sides reduce by 75% since if we imagine a vertical straight line on a sheet and then imagine what happens when we shrink the sheet by 75%, I would say that the length of the line gets reduced by 75%. Now imagine that the line has a semi circle such that the line is a diameter. Again, if the sheet is shrunk by 75%, the length of the line reduces by 75% but the area of the semi circle reduces by much more.

If side of the triangle is s, area is \(\sqrt{3}s^2/4 = A\).
Now the side is s/4.
We need area to be 2A i.e. the side of the triangle should be \(\sqrt{2}s\)

Percentage increase in side = \((\sqrt{2}s - s/4)/(s/4) * 100 = 466%\) approximately

I don't know why they say that the answer is 3100%. While blowing up the picture, they are assuming that the reference is area and not sides!