Convex' Concave means "hollowed out or rounded inward," and it's a simple term to remember because these surfaces "cave" inward. Convex, on the other hand, means "curved or rounded outward." Both terms have been around for centuries, but they are frequently confused. The most useful vocabulary words are those that you can almost instantly recall and use. After all, learning vocabulary is only useful if you can actually use it in a piece of writing and, more importantly, if you can use it correctly.

Rayhan E.R

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