the enclosing boundary of a curved geometric figure, esp. a circle.
the distance around a circle
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The three most common ways to describe the dimension or size of a circle is either the diameter or the radius or the circumference (perimeter).When the circumference is given then dividing that by Pi will give you the diameter (circumference / Pi = diameter).
It has two which are its circumference and its diameter
There's some information missing: the shape, the dimension and the unit of measurement. If that's a 10 inch circle, the circumference is pi times the diameter or approximately 31.4159265 inches
it has no dimension
Notice that if you were to slit the cylinder down the side, unroll it, and lay it flat,you'd have a rectangle, with one dimension equal to the circumference of the base,and the other dimension equal to the height of the cylinder.The surface area is just "rectangle's" (length) x (width) = (2 pi R) x (h) .