Pythagorean Theorem

The Pythagorean Theorem is a fundamental principle in geometry stating that in a right-angled triangle…

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28 worksheets · answer keys · full story · quiz · Ages 3-5 · CEFR A1

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The story

The Secret of the Perfect Corner

Hello. Do you like to play with shapes? I do. My favorite is a special kind of triangle. It has one perfect corner, just like the corner of a building block or a picture book. It feels very neat and tidy. This triangle has two sides that stand up straight and tall, and one long, slidey side. It's so fun to trace with your finger. I am a secret rule that connects all three sides together like a family. My secret helps them always fit just right. It is a very happy secret about how shapes work together to make something strong and beautiful.

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About

The Pythagorean Theorem is a fundamental principle in geometry stating that in a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides (a² + b² = c²).

Known Use 1800 BCE

Formally Proven 570 BCE - 495 BCE (circa)