Part of an object that bulges, protrudes or curves outwards.

This term defines a shape in relation to concavity. The degree of convexity (or concavity) of a figure or part of a figure is measurable.

Educational note

The curvature (and therefore convexity or concavity), roughness, edge, angles, vertices, etc. of plane or three-dimensional figures are measurable properties of geometric figures and of the real shapes that they describe. These measurements sometimes refer to related topological characteristics that belong to areas of study beyond the scope of the primary and secondary level content of this glossary. It may be relevant to mention that the tools used to describe—and therefore measure—the concavity and convexity of a figure are the same tools used to program surfaces in 3-D computer modelling.

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