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PD12M

Open book with a drawing of a triangle on it

The image shows an open book with a drawing of a triangle on it, placed on a black surface.

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The image shows an open book with a drawing of a triangle on it, placed on a black surface. The book contains diagrams and text, providing further details about the triangle.

Credit: Wikimedia Commons
License: https://creativecommons.org/publicdomain/mark/1.0/

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