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Half an oval is called a semicircle. It's like an oval that got cut in half, so now it's just half the fun. But hey, at least it's still technically correct!
An eclipse is another name for an oval.
the formula for calculating the surface area of an oval is A = Pi * a * b where a & b are the semimajor(half the long) and semiminor(half the short) axes
There are several different "oval" shapes. A running track, which comprises two semicircles separated by two straight stretches is an oval. So is the cross section of an egg - a shape in which the cross-sectional width does not change uniformly. Another example is the ellipse. Because all these shapes are called ovals, there is no single name.
An ellipse is the proper name for an oval shape, however, a circle is a closed curved shape similar to an oval shape.