- #include <stdio.h>
- #include <math.h>
- #define PI 3.1415926
- int main()
- { float a,b,c,s,alfa; double af,s,c;
- printf("请输入△两边值和夹角a:");
- scanf("%f%f%f",&a,&b,&alfa);
- af=alfa*PI/180;
- c=sqrt(a*a+b*b-2*a*b*cos(af));
- s=a*b*sin(af)/2;
- printf("第三边C=%.1f面积S=%.1f",c,s);
- }
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