CLS
SCREEN 12
INPUT "enter the width", w
INPUT "enter the length", l 'enter the screen dimensions
WINDOW SCREEN (0, 0)-(w, l)
DO
r = INT((3 - 1 + 1) * RND + 1) 'pick a random number 1-3
IF r = 1 THEN
i = 0
j = 0
ELSEIF r = 2 THEN
i = 0
j = l 'the three points on the triangle
ELSEIF r = 3 THEN
i = w
j = l
END IF
x = (x + i) / 2
y = (y + j) / 2 'divide by half and plot
PSET (x, y), 255
LOOP
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