include stdio include stdlib include conio include math int main void

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <math.h>
int main(void)  
{
	double K,H,D,a,b,c;
	printf("Vvedite K \n");
	scanf("%lf",K);
	printf("Vvedite D \n");
	scanf("%lf",D);
	printf("Vvedite H \n");
	scanf("%lf",H);
	a=2*(M_PI)*sqrt(K/ M_PI );
	b=6*H*sqrt(3);
	c=2*sqrt(2*D);
	if (a>b&&a>c)
	 printf("Perimetr kruga bol'shij");
    else 
	 {
	 	if (b>a&&b>c)
	 	printf("Perimetr treugol'nika bol'shij");
	 	else
	 	printf("Perimetr kuba bol'shij");
	 }
	system("pause");
	return 0;
}