Mọi người giúp e hai bài này vs ❤️

\begin{array}{c} \color{#db1616}{\texttt{#Khoadang09}} \end{array}

*Bài 2 :

#include <stdio.h>
#include <math.h>
int main(){
    double a, b, c;
    scanf("%lf%lf%lf",&a,&b,&c);
    double p = (a + b + c) / 2 ;
    double s = p * (p - a) * (p - b) * (p - c);
    printf("%.2lf",sqrt(s));
}

*Bài 3 :

#include <stdio.h>
#include <math.h>
#define sqr(x) pow(x,2)
int main(){
    double x1, x2, y1, y2;
    scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2);
    double C = sqrt(sqr(x1-x2)+sqr(y1-y2));
    printf("%.2lf",C);
}