In geometry, describing points or lines that lie on the same plane or flat surface.
From prefix 'co-' (together) plus 'planar' (from Latin 'planus' meaning flat or level), indicating shared existence in a single plane.
Coplanarity is crucial in 3D graphics and engineering—if points aren't coplanar, your bridge pieces won't fit together properly, which is why engineers obsess over this seemingly abstract geometric property.
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