You don't have to worry about recognizing it when you see it, since there's
no such thing as a circle with two different dimensions. Every outer dimension
of a circle is the same number.
No matter how you rotate a circle before you close it in a vice, the vice is always
open to the 'diameter' of the circle ... a constant number for a circle.
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Circle
An arc is just part of the circumference of a circle.
half of the circle plus a little more
A circle because there are 360 degrees around a circle.