The circle's length (or circumference) is determined with the expression C=D(pi).
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The radius of a circle is half of its diameter
It the circular face is uniform along it's length then the shape is a cylinder.
Depends on the figure: square/rectangle is length time height Triangle is .5base times height Circle is pi r^2
A circle is a round figure with all points equidistant from the center. Radii of equal length is the main defining characteristic of a circle.
The length around a circle is the circumference The length across a circle is the diameter