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Nine plus sixteen is twenty-five

Name: Nine plus sixteen is twenty-five
Uploaded: 2026-11-11T08:02:24.211Z
Duration: 10 s
Description: A 3-4-5 right triangle drawn in chalk, a square on each side shaded in yellow and blue, the 25 on the long side circled in pink, then 9 + 16 = 25 and a² + b² = c² written out and double-underlined.

A 3-4-5 right triangle drawn in chalk, a square on each side shaded in yellow and blue, the 25 on the long side circled in pink, then 9 + 16 = 25 and a² + b² = c² written out and double-underlined.

Chalkboard Lesson

16:9 · 30fps · 10.0s · en/US

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Example request

Explain the Pythagorean theorem on a chalkboard with a 3-4-5 right triangle: the squares on the two short sides hold 9 and 16, together 25, exactly the square on the long side, so a² + b² = c².