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Planar faces that fill gaps in a model’s surface and can have three or more sides are polygons. In 3D modeling, a polygon is a flat, planar piece that forms a face of a mesh; these faces can be triangles or have four or more sides, and they join together to create the exterior form. Extents describe a bounding box around the object, keyframes mark specific points in an animation timeline, and a gizmo is the on-screen tool used to move, rotate, or scale objects. Therefore, polygons best fit the description.