Question 1201827
Bigger square Area = 75cm^2

Side ^2 = area

side = {{{sqrt75}}}

= {{{5sqrt(3)}}}

Similarly small square side = {{{3sqrt(3)}}}

Observe fig and get perimeter of the fig

 *[illustration squares.png]

3*3sqrt(3)+ 3*5sqrt(3) +2sqrt(3)
Add it up