How to Say "flat surface" in Spanish
The Spanish word for “flat surface” is “faceta” — B2 level.
English → SpanishB2
nounB2
geometric or anatomical surface

Examples
El diamante tiene cincuenta y ocho facetas.
The diamond has fifty-eight facets.
La luz brilla en cada faceta del cristal.
The light shines on every facet of the crystal.
Counting parts
When talking about physical objects, we often use 'de' to describe what it is made of: 'facetas de cristal'.
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