I know the following definition:
"A line is perpendicular on a plane if and only if it is perpendicular on every line from that plane".
I saw on internet that this is not true. Why?
2026-04-09 02:05:23.1775700323
A line is perpendicular on a plane if and only if it is perpendicular on every line from that plane.
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Quite frankly, the claim that this is false seems to be fake news. This definition is accurate.
Although, if you are working in non-Euclidean geometry, then I suppose you could alter the definition of perpendicular points to somehow force the definition to be true.
Clarification (special thanks to @Aretino):