Geometry

Question Analysis
This question involves understanding the geometric definition of a sphere.
The main focus is identifying the precise conceptual meaning of a sphere in three-dimensional geometry.

Key Concept Explanation
A sphere is defined mathematically as:
“The set of all points in 3D space that are equidistant from a single fixed point (called the center).”
This definition emphasizes:
Roundness in every direction
No edges, no vertices, no flat faces
Uniform curvature

Step-by-Step Solution
Option A: This describes a cone → has a flat base and pointed top → eliminate
Option B: This describes a polyhedron → made of flat faces and edges → eliminate
Opt...