# Tangent of 22.5° - Proof Wthout Words

Here's a proof without words by Grégoire Nicollier from Sion, Switzerland.

Grégoire notes that the proof can be directly folded from the standard A4 paper sheet (whose dimensions \(11.7''\times 8.3''\) or in metric millimeters \(297×210\)) have been specifically designed to approximate \(\sqrt{2}\times 1\).

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