Dallan’s law


dallan’s law is an epigram that is typically stated as: “if angle looks like 90 degrees, then it is 90 degrees.”

the law is often followed by mistake in math where someone -ssumes that an angle in a triangle is 90 degrees so they can use rules that only can be applied to right triangles.
david: why do i get the wrong answer when i use the pythagorean theorem?

teacher: beacause it does not contain a right triangle. you probably utilized dallan’s law.

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