I find it easier to have a visual for when solving for shapes. You should solve for area of the semicircles by doing A=(3.14r^2)/2
Radius in this case is the base /2
In a Calculator that can be inputted as (3.14(4))/2
for this problem though I'm afraid that I need to know whether the height belongs to the figure as a whole or just regarding the rectangle.
If it is just the rectangle then we can do A=B*h
A= 4*5= 20
20 + semicircle
20 + 6.28
Total= 26.28