Not sure this is the right place to ask this question but couldn't think of another category for it to go in. I am trying to establish the name of a shape that has the bottom in the shape of an oblong and the top is half of a circle.
I think you're thinking 3D whereas I think the OP means a 2D shape. Imagine an oblong with the top line replaced with a semi circle. Not sure it has a name.
I agree with ZM, it's a 2 D shape. Don't know if it has a name but a rectangle with a semi-circle at both ends is called a stadium. So maybe a semi-stadium?