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//
// P.32
import java.io.*;
class Area
{
public static void main(String[] args) throws IOException
{ float r, area;
BufferedReader in;
in=new BufferedReader(new InputStreamReader(System.in));
System.out.print("\nGive redius r: ");
String str = in.readLine();
r = Float.parseFloat(str);
area = 3.14159f*r*r;
System.out.println ("Area = " + area);
}
}