Geometry

Question Analysis
This advanced problem tests understanding of frustum surface area calculations, requiring knowledge of trapezoidal lateral faces.

Key Concept Explanation
For square pyramid frustums:
Lateral area = 4 × [½ × (base side + top side) × slant height]
Each lateral face is a trapezoid

Step-by-step explanation
Lateral area = 4 × [½ × (base side + top side) × slant height...