After taking gold in the halfpipe snowboarding event in each of the past two Olympics, American star Shaun White was in line to add some additional hardware to his trophy case with a medal in the new slopestyle event in Sochi...
Any point of an oval belongs to an arc with a constant radius (shorter or longer), but in an ellipse, the radius is continuously changing. In common speech. In common speech, oval means a shape rather like an egg or an ellipse, which may be two-dimensional or three-dimensional.
Diameter Symbol - the diameter symbol indicates a circular feature when used on the field of a drawing or indicates that a defined tolerance is diametrical when used in a feature control frame. Dimension - A dimension is a numerical value expressed in appropriate units of measure and indicated on a drawing.