### 1. 2D Scaling Program Using C Programming

 `#include``#include``#include``#include``#include`` ``int x1,y1,x2,y2,x3,y3,mx,my;``void draw();``void scale();`` ``void main()``{``   int gd=DETECT,gm;``   int c;``   initgraph(&gd,&gm," ");``   printf("Enter the 1st point for the triangle:");``   scanf("%d%d",&x1,&y1);``   printf("Enter the 2nd point for the triangle:");``   scanf("%d%d",&x2,&y2);``   printf("Enter the 3rd point for the triangle:");``   scanf("%d%d",&x3,&y3);``   draw();``   scale();``}`` ``void draw()``{``   line(x1,y1,x2,y2);``   line(x2,y2,x3,y3);``   line(x3,y3,x1,y1);``}``void scale()``{``   int x,y,a1,a2,a3,b1,b2,b3;``   int mx,my;``   printf("Enter the scalling coordinates");``   scanf("%d%d",&x,&y);``   mx=(x1+x2+x3)/3;``   my=(y1+y2+y3)/3;``   cleardevice();``   a1=mx+(x1-mx)*x;``   b1=my+(y1-my)*y;``   a2=mx+(x2-mx)*x;``    b2=my+(y2-my)*y;``    a3=mx+(x3-mx)*x;``   b3=my+(y3-my)*y;``   line(a1,b1,a2,b2);``   line(a2,b2,a3,b3);``   line(a3,b3,a1,b1);``   draw();``   getch();``}`