Geometry

Question Analysis
This question tests the ability to identify non-similar figures by checking for inconsistent ratios in corresponding dimensions.
The main focus is distinguishing between perfectly similar solids and those with partial proportionality.

Key Concept Explanation
For polyhedrons, all linear dimensions (base sides and height) must scale uniformly.
Solids like spheres and cubes are always similar because they have only one defining dimension (radius or edge length).

Step-by-Step Solution
Option A: All spheres are similar.  
Option B: Cubes scale uniformly: .  
Option C: Regular tetrahedrons scale uniformly: .  
Option D:  
 Base sides ratio:

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