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Open book with a drawing of a triangle on it

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.

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The image shows an open book with a drawing of a triangle on it. The book is filled with text and diagrams, and the triangle is drawn in the center of the page. The text is written in a neat, cursive font and the diagrams are intricate and detailed.

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

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