Yes.
Yes.
Yes.
Yes.
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the enclosing boundary of a curved geometric figure, esp. a circle. the distance around a circle
It has two which are its circumference and its diameter
It's basically a circle with an added third dimension of height.
Not necessarily. There are over 60 recognised uses of the abbreviation. Among the better known ones are "Binary Coded Decimal" and "Birth Control Device" but not "Bolt Circle Dimension".
The 3 dimensional version of a circle is a sphere - a round ball. You can make it out of putty or papier mache.