3D Coordinate System Diagram

A clear, minimalist diagram illustrating a foundational element of a 3D coordinate system. It features a grey elliptical shape, suggesting a circular base viewed in perspective, with its implied center marked. From the center, a solid line extends upwards and a dashed line diagonally, indicating the presence of axes. A prominent arrow originating from the center points to the edge of the ellipse, labeled 'r', representing its radius. This visual is ideal for understanding spatial relationships in geometry or physics contexts.

3d - coordinate system - diagram - radius - ellipse - geometry - math