Geometry

Question Analysis:
This problem involves lateral area of a non-triangular prism.
The main focus is using perimeter × height.

Key Concept Explanation:
The lateral faces of a prism are rectangles, and when we multiply the perimeter of the base by the height, we are essentially adding up the areas of all the lateral rectangular faces.
Lateral Surface Area = Perimeter of base × height

Step-by-Step Solution:
Given: Perimeter = 30 cm, height = 7 cm
Lateral Area = 30 × 7 = 210 cm²

Common Mistakes:
Confusing lateral with total area

Summary:
Later...