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to determine the radius if you only have the diameter, you divided the diameter by 2. then there you have it ! you have the radius !
Only cyclic polygons can have a radius and they are a tiny, tiny minority of very special types of polygons. For the vast majority of polygons, the concept of a radius makes no sense. Next, even if the polygon was assumed to be cyclic, there is not enough information provided by its area to determine the number of sides - which, in turn will determine its dimensions. For example, the polygon could be a long thin rectangle with a very large radius, or a near-square with a small radius.
pi radius squared. (radius squared, then multiply by pi.)
Use this formula where r is the radius: C = 2Pi(r)
2 Pi