C Program to Draw a Triangle using Graphics

#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<graphics.h>
main()
{
  int gd, gm, a;
  gd=DETECT;
  initgraph(&gd, &gm, "C:\\TC\\BGI");
  printf("Enter the value of side of equilateral triangle: ");
  scanf("%d", &a);
  setcolor(BROWN);
  moveto(150, 250);
  linerel(a,0);
  linerel(-a/2, -sqrt(3.0)/2*a);
  lineto(150, 250);
  outtextxy(20, 450, "Press any key to continue...");
  getch();
closegraph();
}

Output: