Geometry

Question Analysis
This involves a square base and slant height.
The main focus is using the standard surface area formula.

Key Concept Explanation
Surface area = base area + 1/2Pl

Step-by-step explanation
Base area = 12 × 12 = 144
Perimeter = 4 × 12 = 48
Lateral area = ½ × 48 × 10 = 240
Surface area = 144 ...