C8 : Area of a triangle

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//To find Area of a triangle 

#include<stdio.h>
#include<conio.h>
void main()
   {
   clrscr();
   float a=3.14,b,c;
   printf("Enter Radius\n");
   scanf("%f",&b);
   c=a*b*b;
  printf("Area=%f",c);
getch();
}
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Output
Enter radius
3
Area=28.26
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