Question 1150817
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Your description is not clear.<br>
The area of the rectangle is 20x12 = 240 square feet.  I don't know what you mean by the "correct area" of the rectangle.<br>
I can't picture full circles on each end of the rectangle, with "half the circles partially covering both sides of the rectangle".  I picture a rectangle with a half circle at each end; I don't know what to make of the description that there are full circles at each end of the rectangle.<br>
If indeed the picture is simply a rectangle with half circles added at each end, then the total area is the area of the rectangle plus the area of two half circles, and that of course is the area of the rectangle plus the area of one circle.<br>