题解 | #计算三角形的周长和面积#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        float a = sc.nextFloat();
        float b = sc.nextFloat();
        float c = sc.nextFloat();
        float p = (a + b + c) / 2;
        System.out.printf("circumference=%.2f area=%.2f", p*2, Math.sqrt(p*(p-a)*(p-b)*(p-c)));
    }
}