angle that for a given dihedral angle is formed by two intersecting lines each of which lies on a face of the dihedral angle and is perpendicular to the edge of the face
Tasanurk on kahemõõtmeline geomeetriline mõõde kahe lõikuva sirge või kiire vahelisele avatusele või pöördele; need sirged või kiired kohtuvad ühises punktis.
A plane angle is a two-dimensional geometric measure of the opening or turn between two intersecting straight lines or rays that meet at a common point.
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