To find this, you will have to find the circumference of one of the circles. you have to do this because you only have the height of the "rectangle" but not the length. the circumference is the length. :)
So to find circumference, you use 3.14(r)^2... so 3.14(5)^2 ..... so then this becomes 3.14(25) .... then its 78.5
Now that you have found the circumference (also the height of the rectangle), you just multiply b(h) of the triangle to find area. So 78.5(9) = 706.5in.^2
I believe this is your final answer is 706.5 in.^2 :)