Please help
I'm not quite clear from your pic if x is the radius or diamter of the circular part--I'll proceed assuming it is the radius
P = 3sides of a rectangle + 1/2 circumference
1) P = (2x + 2 y) + pi x = 28
2) A = 2xy +1/2 pi x^2
Solve 1) for y y = (28 - 2x -pi x)/2
Now plug this into 2)