//by peronet
package Hardstuff;

import java.util.Scanner;

public class cosinussatsen {

	public cosinussatsen() {
		
	}

	public static void main(String[] args) {
		

		Scanner in = new Scanner(System.in);
		
		
		
		System.out.println("skriv in en sida");
		int sidaA = in.nextInt();
		
		System.out.println("skriv in en annansida");
		int sidaB = in.nextInt();
		
		System.out.println("skriv alfa vinkeln");
		double vinkel = in.nextDouble();

		
		in.close();

		double a =	cossats(sidaA,sidaB,vinkel);
		System.out.println(a);

			}

	private static double cossats(int q, int w, double e) {
				
		double done = ((q*q) + (w*w) - (2*q*w* Math.cos(e)));
		
		done = Math.sqrt(done);
		
		return done;	
		}
		
}