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The Guardian - UK

Science

Alex Bellos

Did you solve it? Here’s (not) looking at Euclid

Adam Kucharski Earth

Collage of donut with chocolate glaze and red apple on the yellow background. Copy space. Top view. Close-up.

Earlier today I set you these mind-mangling puzzles about non-Euclidean geometry, in which the internal angles of triangles do not add up to 180 degrees.

1. Right, Right, Right.

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