Erlebnisland Mathematik | Technische Sammlungen Dresden | Junghansstraße 1-3 | 01277 Dresden
Erlebnisland Mathematik

Proofs without words: Area of a circle

A “proof without words” convincingly justifies a mathematical claim just by a picture.

Pull the levers down to flatten the spring. The triangle has the same area as the circle. It is half the perimeter times the radius.

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