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Forget Pi Day. Today is Pythagorean Triple Square Day.

The date 9/16/25 features perfect squares whose roots form the rare Pythagorean triple 3, 4, 5, a unique event occurring once this century, experts say.

Summary by Popular Science
September 16, 2025 holds extra special mathematical significance.

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KPBS broke the news in on Tuesday, September 16, 2025.
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