A sphere is a perfectly round three-dimensional geometric shape. Every point on the surface of a sphere is equidistant from its center. It’s the 3D analogue of a circle and is widely used in geometry, physics, and engineering.
\[ A = 4 \pi r^2 \]
\[ V = \frac{4}{3} \pi r^3 \]
\[ d = 2r \]