#include <stdio.h>
#include <conio.h>
main()
 
{
	 printf("Progrem : calculate  the area of a qudrilaferal\n");
	 float a,b,c,d,e;
	 printf("input a :");
	 scanf("%f",&a);
   	 printf("input b :");
   	 scanf("%f",&b);
   	  printf("input c :");
   	 scanf("%f",&c);
   	 printf("input d :");
   	 scanf("%f",&d);
   	 e= a*(b+c)*d ;
   	  printf("Result :%.2f",e);
		printf("\nBy : kanyanat Somchai No.10");
   	 
}