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Start with a blue equilateral triangle. Add three green equilateral triangles at the corners. Connect the corners of the green triangles with three black lines. Join the midpoints of these three lines to form a red triangle. Remarkably, it is always equilateral! Drag the locators to change the propeller triangles.
Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA
Wolfram Demonstrations Project
Published: March 7 2011