用c语言判断三点是否构成三角形。并计算周长和面积

可以回答这个问题。以下是用 C 语言判断三点是否构成三角形，并计算周长和面积的代码：

#include <stdio.h>
#include <math.h>

int main()
{
float x1, y1, x2, y2, x3, y3;
float a, b, c, s, area;

printf("Enter the coordinates of three points:\n");
scanf("%f %f %f %f %f %f", &x1, &y1, &x2, &y2, &x3, &y3);

a = sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));
b = sqrt(pow(x3 - x2, 2) + pow(y3 - y2, 2));
c = sqrt(pow(x1 - x3, 2) + pow(y1 - y3, 2));

if (a + b > c && b + c > a && c + a > b)
{
printf("The three points form a triangle.\n");

printf("Perimeter = %.2f\n", a + b + c);

s = (a + b + c) / 2;
area = sqrt(s * (s - a) * (s - b) * (s - c));
printf("Area = %.2f\n", area);
}
else
{
printf("The three points do not form a triangle.\n");
}

return 0;
}