题解 | #计算三角形的周长和面积#

#include <stdio.h>
#include<math.h>
int main()
{
	float a, b, c;
	double circumference, area, jungle;
	scanf("%f %f %f", &a, &b, &c);
	circumference = a + b + c;
	jungle = (a * a + c * c - b * b) / (2 * a * c);
	area = 0.5 * c * a * sqrt(1 - jungle * jungle);
	printf("circumference=%.2lf area=%.2lf", circumference, area);
	return 0;
}