PLOT 101 tells the computer to draw a rectangle with opposite corners at the

last point visited and the present point:

Change line 20 and RUN the program again:

20 MOVE 300, 100

You may not be surprised to see that the rectangle gets smaller because the

position of the first corner has changed. If you wanted to plot a whole series of

identical rectangles in different positions, you would have to calculate the new

position of the opposite corner for every rectangle. There is, however, another

PLOT command which avoids this problem by describing the rectangle slightly

differently.

C l7