True oval have no sharp corners
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True, if its not then its an elipse (oval)
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.
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.
Not quite sure what you mean by "true way". You can measure it with a string or a similar flexible object. Or you can measure length and width, and - assuming it is an ellipse - use the formula for the circumference of an ellipse - or rather, an approximation formula.