I need help finding the shaded region

First you would find the area of the rectangle; 34 • 14 = 476. Then you find the area of the semicircles. To make things easier you can put them together to make a circle and use the formula pi • r^2. So the equation would be set up as 3.14 • 7^2. I used 7 because the diameter is 14 and the radius is half of that. So the answer to that is 153.86. I’m not sure if you can round but in this case I won’t. So you would then subtract; 476 - 153.86 making the answer 322.14 units^2