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The Sierpinski triangle is a fractal whose envelope is an equilateral triangle and which is composed of three half-sized Sierpinski triangles.

A fractal is a geometric shape which is self-similar and has fractional dimension.The Polish mathematician Waclaw Sierpinski (1882-1969) introduced his fractal in 1916.
See also:The Sierpinski Triangle & Machu Picchu Fractal illustration with animation. Machu Picchu and Geometric Art

More puzzles: Puzzles: Table of Content, Nazca Lines: Condor, Nazca Lines: The Monkey,  Nazca Lines: The Spider,  Machu Picchu,  Sierpinski Triangle and Machu Picchu,  The Stone of twelve angles,  The Lord of Sipan,  The Lord of Sipan: Spiderman,  Butterfly Theorem,  Bevan Point,  Ceva's Theorem, The Raft of the Medusa,  The Raft of the Medusa (Chinese version),  The Raft of the Medusa(Spanish version),  Euler's Formula,  Morley's Theorem, Nagel Point, Newton's Theorem,  Pentagons & Pentagrams.