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Impossible Diagrams

The aim of this task is to argue, conclusively, about whether or not the following shapes and diagrams can actually exist! To be successful, you will have to use what you know and can deduce about the geometry of triangles and intersecting lines! It is a simple task to understand, but might not be so simple to achieve. It is not enough to have a "feeling" about whether or not these could exist, you have to be able to...

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