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Use a Pencil, a string, and 2 nails (or tacks). Mount the 2 nails(or tacks) on a drawing surface. Tie a string into a loop such that it will go around the 2 nails with plenty of extra slack. Lay the string so it encircles the 2 nails. Using your pencil, place it inside the string and pull it one direction so the string loop forms a triangle between 1 nail, the other nail and the pencil point. Now move the string around the nails while keeping the string pulled tight. The pencil will trace an Ellipitcal oval shape.
An ellipse always has two axes of reflection; an oval has one or more.So, an egg-shape is an oval, but not an ellipse.In short an ellipse is an oval, but an oval may or may not be an ellipse.
True oval have no sharp corners
An oval is two-dimensional. An ovoid is a three-dimensional shape based on an oval - like an egg,
It is called an oval - which is not the same as an ellipse.