#include <stdio.h>
#include <conio.h>
main()
{
	printf("program :caleulating the area of an equila teral rectangle\n");
	float a,b,c,d,e;
	printf("input a :");
	scanf("%f",&a);
	printf("\ninput b :");
	scanf("%f",&b);
	printf("\ninput c :");
	scanf("%f",&c);
	printf("\ninput d :");
	scanf("%f",&d);
	e=a*(b+c)*d;
	printf("Result : %.2f",e);
	printf("\nBy : kanyaphak sripamai no.11");
}