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A Geometric Proof of the Square Pyramidal Number Formula
The pyramidal numbers 1, 5, 14, 30, … are the sums of the square numbers, . This Demonstration shows a geometric proof of the square pyramidal number formula, . In the figure the six pyramids of side length form an cuboid.




"A Geometric Proof of the Square Pyramidal Number Formula" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/AGeometricProofOfTheSquarePyramidalNumberFormula/
Contributed by: Okay Arik
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