Question 1186705
Dimensions of rectangle
w+4 and w
Perimeter is {{{2(w+4)+2w=4w+4}}}.

Rectangle's area is {{{w^2+4w}}}.


Semi-circle, radius 17 meters
Area is {{{(1/2)pi*17^2=(289/2)pi}}}

Perimeter is  {{{(1/2)2pi*17+34=17pi+34}}}



The two perimeters are equal in length.
{{{4w+4=17pi+34}}}
-
{{{4w=17pi+30}}}

{{{highlight_green(w=(17pi+30)/4)}}}---------width


{{{highlight_green(w+4=(17pi+30)/4+4)}}}---------length


You can multiply to get the area and simplify, or compute the value.