#include <stdio.h>
#include <conio.h>
main()
{
	float a,b,c,d;
	printf("Program:Calculate the area of a trapezium\n");
	printf("\nInput A :");
	scanf("%g",&a);
	printf("\nInput B :");
	scanf("%g",&b);
	printf("\nInput C :");
	scanf("%g",&c);
	d = 0.5*a*b*c;
	printf("\nResult put : %g",d);
	printf("\nBy:Yotsapon Chotruen");
}