package Questions;
import java.util.Scanner;
public class Q2 {
	//Return true if the sum of any two sides is greater than the third side.
	public static boolean isValid(double side1, double side2, double side3){
		if(side1+side2>side3) return true;
		if(side1+side3>side2) return true;
		if(side2+side3>side1) return true;
		return false;
	}
	//Return the area of the triangle.
	public static double area(double side1, double side2, double side3){
		double s = (side1+side2+side3)/2;
		return Math.sqrt(s*(s-side1)*(s-side2)*(s-side3));
	}
	public static void main(String[] args) {
	Scanner input = new Scanner(System.in);
	System.out.println("Enter three sides in double: ");
	boolean valid = false;
	double s1,s2,s3;
	do{
		s1 = input.nextDouble();
		s2 = input.nextDouble();
		s3 = input.nextDouble();
		valid = isValid(s1,s2,s3);
		if(valid)break;
		System.out.println("Invalid input. Try again.");
	}while (!valid);
	System.out.println(String.format("Area: %f",area(s1,s2,s3)));



	}

}