Problema Resuelto 09

09 .-  AREA DE UN CIRCULO



/*
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package problema9;
import java.io.*;
/**
 *
 * @author ABEL MONTALVAN
 */
public class Problema9 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        // TODO code application logic here
    
    //const float PI = 3.14159F;
     final float  PI=3.14159f;
        float a,r;
    
 BufferedReader in =new BufferedReader(new  InputStreamReader(System.in));
 System.out.println("Radio: ");
        r=Float.parseFloat(in.readLine());
        
    a=(float)(PI*(Math.pow((double)r, 2.0)));
        
 System.out.println("");
 System.out.println("Área: "+a);

    }
}