জ্যামিতিক আকৃতির ক্ষেত্রফল-C

#include <stdio.h>

#include<math.h>

int main()

{

double pi=2*acos(0.0),R,B,H;

char m;

scanf("%c",&m);

switch(m)

{

case 'c':

{

scanf("%lf",&R);

printf("Circle with area %0.2lf\n",pi*R*R);

break;

}

case 't':

{

scanf("%lf %lf",&B,&H);

printf("Triangle with area %0.2lf\n",0.5*B*H);

break;

}

}

return 0;

}