Answer: 4456.64
Step-by-step explanation: The formula for the area of a circle is pi times the radius of the circle squared. Now in this case we have 2 semi-circles meaning once we get the area we must divide it by 2. The radius is the diameter (the line underneath the semi-circle divided by 2) So we have 40 as the diameter divided by 2 will give us 20 which is our radius. Now you use the formula stated before to get the area of the circle. Then divide the area by 2. Keep in mind the rounded area of the circle was 1256.64 but the actual value is 1256.63706. Now add your two areas of the semi circle plus the area of the rectangle which is 40 times 80.