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Area_of_the_Triangle.java

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import java.util.Scanner;

import java.io.*;

import java.lang.*;

class area{

public static void main(String args[]){

Scanner n= new Scanner(System.in);

float a=n.nextFloat();

float b=n.nextFloat();

float c=n.nextFloat();

float s;

s=(a+b+c)/2;

if (a < 0 || b < 0 || c <0 || (a+b <= c) ||

a+c <=b || b+c <=a)

{

System.out.println("Not a valid triangle");

System.exit(0);

}

else{

double ar;

ar=Math.sqrt(s*(s-a)*(s-b)*(s-c));

System.out.println(String.format("%.2f",ar));}

}

}