Geometry

Question Analysis
This question tests the fundamental property of spheres: all are similar regardless of size.
The main focus is distinguishing similarity from congruence.

Key Concept Explanation
All spheres are similar because they have identical shapes (perfectly round) with no other defining dimensions.
Congruence requires identical size (same radius), which is not the case here.

Step-by-Step Solution
Spheres have only one dimension (radius), and all spheres are similar by definition.

Common Mista...