In the three dimensional figure below, is there a way to prove that $$ \angle MNK = 90^ \circ $$
$\hspace{2.8in}$
2026-04-11 21:52:57.1775944377
Euclidean Geometry a triangle problem
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If I understand the labeling correctly, I don't think so—I don't see anything that prevents $\triangle MNL$ from "falling over" to land flat in the plane of $\triangle KNL$ (or being at any angle in between).