How come the triangles in the picture are all congruent but they don't all look ... | Hacker News

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		amelius on April 9, 2023 \| parent \| context \| favorite \| on: New Orleans teenagers found a new proof of the Pyt... How come the triangles in the picture are all congruent but they don't all look congruent.

scatters on April 9, 2023 [–]

Because the first dropped vertical is too long. The left hand angle is beta plus alpha, so it should be ninety degrees, but instead it's an obtuse angle.

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