WAP to use Macros expansion with arguments

/*WAP to use Macros expansion with arguments */

#include<stdio.h>
#include<conio.h>
#define AREA(x) ( 3.14 * x * x )
main( )
{
 float  r1 = 6.25, r2 = 2.5, a ;
 
 a = AREA ( r1 ) ;
 printf ( "\nArea of circle = %f", a ) ;
 a = AREA ( r2 ) ;
 printf ( "\nArea of circle = %f", a ) ;
       getch();
}