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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It was discovered first by a Persian Mathematician named Al-Karaji, then followed by numerous other people from places such as China.
No idea what an "entovian" triangle is. But the Einthoven's triangle is named after Willem Einthoven, a Dutch physiologist who theorised about its existence. Einthoven invented the first practical electrocardiogram for which he won the 1924 Nobel Prize for Medicine.
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Sounds like you mean Pythagoras.
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