How to Draw an Impossible Triangle

Step-by-Step Guide

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   Step 1: Sketch an inverted equilateral triangle.

   This will be the center of your triangle.
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   Step 2: Lightly sketch two parallel lines outside one side of the triangle.

   The lines should be equally spaced.
   
   Take caution that your lines are drawn straight. , Your sketch should look like three triangles nested together. , Extend one end of that straight line until it reaches the "middle" triangle. , Extend one end of that straight line, in the same direction as before, until it reaches the "outside" triangle. ,, Each edge of this "3-D" shape should look like a reverse "L". , These short segments will finish off the outside points. ,,
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   Step 3: Do this for each of the other two sides.

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   Step 4: Choose one side of the "center" triangle.

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   Step 5: Find the same side of the "middle" triangle.

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   Step 6: Repeat steps for the other two sides of the triangle.

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   Step 7: Erase short segments so that the triangle begins to look three-dimensional rather than flat.

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   Step 8: Add short segments at an angle in the corners.

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   Step 9: Cleanup your drawing by erasing the points outside of the short segments drawn in the previous step.

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    Step 10: Add shading if desired.

Detailed Guide

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