JAVA
java
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import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double pi = 3.14;
//your code goes here
int radius = /* i dont know what do i have to write just here */
double perimeter = pi * 2 * radius;
System.out.println(perimeter);
}
}
/* it gives such an error:
.class expected */
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OUTPUT
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