Geometry

Question Analysis:
This question involves calculating the surface area of four identical cubes stacked vertically.
The main focus is on accounting for the hidden surfaces where cubes connect.

Key Concept Explanation:
When cubes stack vertically:
Each connection hides 2 faces
Total surface area = Combined individual surface areas - 2 × contact areas per connection
For 5 cubes there are 4 connections → 8 hidden faces

Step-by-Step Solution:
Single cube surface area: 6 × (5×5) = 150 cm²
Three separate cubes: 5 × 150 = 750 cm²
Hidden surfaces: 8 faces × (5×5) = 200 cm²
Total ...