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TestPi.java
public class TestPi {
public static void main(String args[]) {
double radius = 2.0;
double area = Math.PI * radius * radius;
System.out.println("The area is " + area);
}
}
C:\javaExample\Math>javac TestPi.java
C:\javaExample\Math>java TestPi
The area is 12.566370614359172
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