หน้า 20

#include<stdio.h>
#include<conio.h>
#include<math.h>
float fouhtarea();
main()
{     
      float area;
      area=fouhtarea();
      printf("4angle area is %.2f\n ",area);
    
      getch();
}
float fouhtarea()
{
      float high,minlent,maxlent,area;
      printf("enter high : ");
      scanf("%f",&high);
      printf("enter minlent : ");
      scanf("%f",&minlent);
      printf("enter maxlent : ");
      scanf("%f",&maxlent);
     
      area=high*(minlent+maxlent)/2;
      return(area);
}