Create a dynamo file that can calculate area of a circle

How can create a dynamo file that can calculate area of a circle

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In Design Script without building a new geometry:

Math.Pi()*Math.Pow(Circle.Radius(cir),2);

By nodes without building new geometry:




Or by design script with new geometry:
Surface.ByPatch(circle).Area;

By nodes with new geometry creation:


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Depending on how you are getting the circle information may depend on the direction you want to go but within the below image has a few examples.