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Pythagoras, or at least he invented and found out everything about the right-angled triangle. The other triangles creators are anonymous, probably created before humans as we know them today lived. It's possible that it was discovered as a triangle by neanderthals who were scratching on the walls. Thanks. The properties of the triangle were known by the ancient Greeks and earlier civilizations.

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9y ago
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Q: Who first discovered the triangle?
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