hi, qr and sr are congruent so qp is 5 too, then 24- 5+5=14 which is the legth for ps plus qr, den divide by 2 so ps and qr are both equal 7. Parallelogram area is bh (base times height) therefore, use 28(the area) divdes by 7(the base) to finde out the height 28/7 is 4. so the height is 4 which is eqvivalent to the height of oq and st. So you know st you know the hypontenuse, use the formula c=square root of a sqaure +b sqaure. Plug it in. 5= sqaure root of x2+4square

25=Xsquare+ 16

9=x2

3=x

there for rt and op are both 3 so 3x2+4x2+7x2+28

Hope this is right PEACE OUT