Definition

Existing or happening in the same flat surface or plane.

Example

The three points are coplanar, meaning they all lie on the same flat surface.

Conversation

Did you notice how those lines on the paper are coplanar?

Yeah, it’s interesting how they all lie in the same plane.

Right? It makes it easier to visualize the whole diagram.

Exactly! It really helps when trying to understand the relationships.

Synonyms & Antonyms

Root Explanation

Coplanar → It is formed from "co-" (meaning together) and "planus" (from Latin, meaning flat or level). The word "coplanar" describes points or lines that lie together on the same flat surface.

Memory Tip

Think of points that are 'together' ('co-') on a 'flat surface' ('planus') — that's what coplanar means.

Visually Confused Words