Sphericity is a measure of how close an irregular object is to which geometry?

• A. A Cube
• B. A Cylinder
• C. A Sphere
• D. A Cone

Answer: (C)

Sphericity measures how similar an irregular object is to a sphere. A sphere is used as the reference because it has the smallest surface area for a given volume and perfect symmetry. For a perfect sphere, sphericity equals 1; any irregular shape has more surface area for the same volume, so its sphericity is less than 1. This makes the metric a direct indicator of closeness to a sphere. Shapes like a cube, cylinder, or cone deviate from a sphere, so they yield sphericity values below 1, reinforcing that the comparison is to the sphere.